Question

Use the substitution method to solve this system x-2y=-1, x+y=5

Answer 1

x-2y=-1
x=-1-2y <=plug in to 2nd equation

x+y=5
(-1-2y)+y=5
-y=6
y=6 <= first answer, plug back in to 1st eqn


x-2y=-1
x-2(6)=-1
x-12=-1
x=11 <=second answer

answers:
y=6
x=11