1. y=x+4

y+3x

2. y=3x-10
y= 2x-5

3.x=-2y+!
x=y-5

4.y=5x+5
y=15x-1

5.y=x-3
y=-3x+25

6.y=x-7
2x+y=8

3 answers

for #'s 2-5, set them equal to each other, so for #2:
2x-5=3x-10, then simplify

for #6, subtract 2x from the second equation, so it's y=2x+8, then set it equal to y=x-7

for #1, is it supposed to be y=3x?

y=5x+5
y=15x-5

y=3x-10
y=2x-5