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ok lets start with the first question
we are given points (8,-8) and slope 3 to put in point slope form|dw:1441393907189:dw|
so would i distribute ?
only the negative sign
which option would we get?
hold on oneee second im almost done
wait so for y-(-8) how woould i distribute that, would it be just be -8y?
so it would be 8y= 3x - (-) 24?
no ... u just need to distbute the 2 negative signs here|dw:1441394401381:dw|
i this case to match the given options the 2 negatives will make positive when....
so 1st question answer??
its y+8 = 3 (x-8) so D
question 2 intercepts to find the x-intercept we let y=0 to find the y-intercept we let x=0 but first we solve the given equation.. 5x+3y=15 lets solve for y 3y=15-5x y=(-5x+15)/3 now find the x intercept.... 0=(-5x+15)/3
you took the 3 away from y to solve for it butbwhy did you put it into the equation to divide. dont we cancel something out?
since the 3 was being multiplied to y....3y ...to get the y term alone we divide by 3...and since its an equation...what we do to the left side we must do the same to the right side ...
ohh okay okay i gotchu
so wats the x-intercept?
i give up
0*3=(-5x+15)/3*(3)...the 3 will cancel on the right side 0=-5x+15 0+5x=-5x+5x+15 5x=15 x=15/5 x=3 the x-intercept (3,0)
okay i understand it better i guess its still a little confusing but ill look over some more later
lets solve the y-intercept y=(-5(0)+15)/3 y=(0+15)/3 y=15/3
so the y-intercept is?
would it be 5
plz put it in point form
okay soo (0,5)
Do u want me to do the 3rd question...or..its ok...
yeah because the way that guy did it really confused me
ok when two lines are perpendicular their slopes=-1 in other words the product of there slope =-1
our equation y=4/9x-2 with point (4,3)
can u tell me the slope for that equation
no because i have no clue whats going on
y=mx+b where m is the slope and b is the y-intercept
m is 4/9x and b is -2?
whats our new slope?
would it be -4/9?
so it would be -9/4x
so we have our new slope m=-9/4 and points (4,3)
would the answer be c?
do u have any question?....
no, thank you so much for helping me !!!