X=10–5y
3(10 – 5y)+6y=12
30–15y+6y=12
30 – 9y=12
-9y=-18
y= 2
Joey has to solve the system of equations using substitution. He has completed the work shown. What should be his next step?
Nothing, he is done
He needs to write his solution as an ordered pair (0.2).
He needs to plug back into one of the equations to find x.
He needs to check his work to make sure he made no mistakes.