need help with some math (BIG REGENTS PREP QUIZ TOMMAROW!)

need help with some math (BIG REGENTS PREP QUIZ TOMMAROW!)

ok i have a big quiz tommarow and i need help with a few questtons) kinda a 8th-9th grade material here so to start off........

1) Can someone explain SOHCAHTOA-im ok with this but on a normal TI-30XIIS calcualotor when do u use sin-1 button

2)also how do you rotate a polygon u made on a graph rotate 90 degrees counterclockwise

2.5-ill be posting more as i reveiw my book

i also hate these y intersept,slop things ok here one

what is the y intercept of the graph of the line whoose equation is

y=-2/5x + 4

i also hate these y intersept,slop things ok here one

what is the y intercept of the graph of the line whoose equation is

y=-2/5x + 4

elmetfano

4 

whats it mean if a fraction is undefined?elmetfano

A fraction that is undefined is #/0 because any number devided by zero is infinite.

need help with some math (BIG REGENTS PREP QUIZ TOMMAROW!)

ok i have a big quiz tommarow and i need help with a few questtons) kinda a 8th-9th grade material here so to start off........

1) Can someone explain SOHCAHTOA-im ok with this but on a normal TI-30XIIS calcualotor when do u use sin-1 button

2)also how do you rotate a polygon u made on a graph rotate 90 degrees counterclockwise

2.5-ill be posting more as i reveiw my book

 

elmetfano

SOHCAHTOA: Sine = Opposite/Hypotenuse, Cosine = Adjacent/Hypotenuse, Tangent = Opposite/Adjacent

i also hate these y intersept,slop things ok here one

what is the y intercept of the graph of the line whoose equation is

y=-2/5x + 4

elmetfano

slope intercept form: y = mx + b

m is the slope and b is the y-intercept (where the line crosses the y-axis). 

whats it mean if a fraction is undefined?elmetfano

when there is a 0 on the bottom...

and sohcahtoa means...

sine opposite hypotenus

cosine adjacent hypotenuse

tangent opposite adjacent 

fraction is undefined when the denominator equals 0

soh = sin = opposite divided by hypotenuse

cah = cos = adjacent divided by hypotenuse

toa = tangent = opposite divided by adjacent

 if you have a triangle, the angle across from the right angle is the hypotenuse

the angle right next to the angle your trying to find/using is the adjacent angle

the angle completely opposite of the angle your trying to find/using is the opposite 

sin-1 is the arcsine I believe...which lets you find the angle.fatm781

yea I think you're right/ 

i also hate these y intersept,slop things ok here one

what is the y intercept of the graph of the line whoose equation is

y=-2/5x + 4

elmetfano

 Easy, just let X be 0

 What is the y intercept?

let 'x' = 0

y = 2/5 (0) + 4

y = -0.4 (0) + 4

y = 4

Therefore, the y intercept of the line whose equation is y= - 2/5 + 4 is 4

y = mx + b

m = slope

b= y intercept

y intercept = 4 

need help with some math (BIG REGENTS PREP QUIZ TOMMAROW!)

ok i have a big quiz tommarow and i need help with a few questtons) kinda a 8th-9th grade material here so to start off........

1) Can someone explain SOHCAHTOA-im ok with this but on a normal TI-30XIIS calcualotor when do u use sin-1 button

2)also how do you rotate a polygon u made on a graph rotate 90 degrees counterclockwise

2.5-ill be posting more as i reveiw my book

 

elmetfano

 SOH - CAH - TOA, basic Trigonometry; an acronym used to remember the 3 basic functions: sine, cosine, tangent

SOH = Sin = Opposite / Hypotenuse

CAH = Cosine = Adjacent / Hypotenuse

TOA = Tangent = Opposite / Adjacent

http://upload.wikimedia.org/wikipedia/en/1/17/Triangle_www_footflyer_com.png 

k im not that good at this but i did it like 2 months ago and i did ok on the test. SOHCAHTOA has three parts to it , a triangle is made up of three parts the longest part is the hypotnuse the side right across from it is that adjecent and the other one is the opposite.i use sohcahtoa as a fraise, some old hippie, caught another hippie, taking opeum again, SOH or sin you need to divide the opposite over the hypotnus, to get the COS or sosine you divide the adjacent over the hypotnuse, the TAO is the tangent, you find that out by dividing the opposite by the adjacent. 

sin A= opposite over hypotnuse

cos A= adjacent over hypotnuse

tan A= opposite over adjacent

i usually only use a basic calculator for the dividing. you should have like a paper that has all the sin cos and tan on them depending on the angle measurement of one side.

for the other things.

for example if i have 3 points (1,0) (2,1) and (3,2) i think you either switch the two numbers and multply b the x integer by -1 or do that with the y integer.

sorry if i just confused you more, im just in 7th grade honors and still learning.                                                    

y=-2/5x + 4

so the slope is 2/5 (down two to the left 5??)

y=-2/5x + 4

so the slope is 2/5 (down two to the left 5??)

elmetfano

down two to the right 5... if you do to the left 5 you are making both the 2 and 5 negative thus making it positive (when you divide a negative by a negative you get a positive)... 

[QUOTE="elmetfano"]

y=-2/5x + 4

so the slope is 2/5 (down two to the left 5??)

TheOT_King

down two to the right 5... if you do to the left 5 you are making both the 2 and 5 negative thus making it positive (when you divide a negative by a negative you get a positive)... 

thanks i somehwat get it

ok this i dont get at all

SOLUTION SETS!

the solution set for the equation x2-5x=6 is...... *says to self what the.......

[QUOTE="TheOT_King"][QUOTE="elmetfano"]

y=-2/5x + 4

so the slope is 2/5 (down two to the left 5??)

elmetfano

down two to the right 5... if you do to the left 5 you are making both the 2 and 5 negative thus making it positive (when you divide a negative by a negative you get a positive)... 

thanks i somehwat get it

ok this i dont get at all

SOLUTION SETS!

the solution set for the equation x2-5x=6 is...... *says to self what the.......

Not sure what those are... but

x1= -2, x2= 2

-2 * 2 - 5 * 2= 6

true