Question

3x+6y=12
x +5y=10
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 had completed the work shown. What should be his next step

Answer 1

His work needs to change his work from the beginning, switching the 10 to 9 because 12-3=9