Please help me solve:

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

&

5X+6y=14
-3y+x=7

2 answers

The first set cannot be solved, the two lines represented in the equations are parallel, and have no solution.

The second set, the second equation tells us that x= 3y+7, put that in the first equation
5(3y+7)+6y=14
15y+6y=14-35 solve for y
21y=-21 21y/21=-21/21 y=-1