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I need help solving for y please! :)

solve for 4x in the top equation and substitute that in to the second equation

I need to get two y=mx+ b equations, so i can graph them. i'm doing the equation wrong.

Do you divide both the slope and b/y intercept by the -4 and 3?

for the 2nd equation, first add +4x to both sides
then divide both sides by -4

That's what i got, but i started pluging number in to get one of the options, nothing worked...

ok, but first, what did you get for the 2nd equation?

y=-1x+7

how did you get that?

by adding -4x to the other side, then dividing by -4; y=4x+28/-4; y=-1+7

looks good except 28/-4 is not +7
you should get
y= -1x - 7

ahhhhhhhhhhhhhhhhhhhhhhhhh.

but how do i get one of the options above? like what numbers should i put in the equations????

gahhhhhhhhhhhhhhhhhhhhh, i tried that, for some reason it's not workingg:(