I'm learning substitution in class . David earns $1.50 per hour more than Peter. Together, they earn $940 if they both work 40 hours in a week.

Question

how much money per hour do David and Peter earn?

Answer 1

Let p = Peter's hourly pay rate; then (it says) David's = p + 1.50

 

What they earn if both work 40 hours is 40p + 40(p+1.5) = 940

 

80p + 60 = 940, after distribution

 

80p = 880   so   p = 11, i.e. Peter makes $11 per hour, David makes $12.50.

 

Study this & see how easy it really is--then you're on your way to great success in math.