Question

Make an equation to solve this problem:

Barrys mountain bike weighs 6 pounds more than Andy's. If their bikes weighs 42 pounds altogether how much does barry's bike weigh? Identify the if-then moves in your equation.

Answer 1

b=a+6
b+a=42
susitute
a+6+a=42
subtract 6
2a=36
divide 2
a=18
subisute
b=18+6=24

b=24
a=18