Question

-2x+5y=5
x=4y-10

Substitution method

Answer 1

-2(4y-10)+5y=5
-8y+20+5y=5
-3y=-15
y=5

x=4(5)-10
x=10

Answer 2

-2(4y-10)+5y=5
-8y+20+5y=5
-3y=-15
y=5

Answer 3

Thank you --- I forgot to drop down the 5y when I was solving. -.-