david earns $1.50 per hour more than Peter. Together they earn $940 if they work 40 hours per week. How much do they make per hour?

Question

This is question is using the substitution method.

Answer 1

David earns $1.50 per hour more than Peter. Together they earn $940 if they work 40 hours per week. How much do they make per hour?

Let,
Peter = X
David = X + 1.50

40 hours per week times Peter’s hourly rate and David’s hourly rate = $940 per week is written like so:

40(x + x + 1.50) = 940
80x + 60 = 940
80x = 880
X = 11

Peter = $11 ($440 per week)
David = $12.50 ($500 per week)