Question

If 5 x 6 = 20 + y, what is the value of y?

Answer 1

5 x 6 = 30

y + 20 = 30

y + 20 - 20 = 30 - 20

y = 10

Answer 2

5*6=20+y

30=20+y

30-20=20-20+y

10=y

Check answer by using substitution method

5*6=20+y

30=20+10

30=30

Answer is y=10