Question

here is the 2nd problem: 15x-20y=7 & 15y=-4+5x. Solve by the substitution method.

Answer 1

Wow, elimination sounds a lot easier for this one, huh?

Answer 2

if we solve for the right equation for x, we will get x = 3y + 4/5

Answer 3

all you have to do is to plug this in into the equation 15x -20y = 7

Answer 4

it's gonna look like this 15 (3y+4/5) -20y =7

Answer 5

Then you just solve for y :)

Answer 6

ok I came up with y--1/5