Question

Sabrina has two part-time jobs delivering flyers. She earns $9/hour at her weekday job and $12/hour at her weekend job. Last week she worked 23 hours and earned a total of $231. Determine how many hours she worked at each job.

Answer 1

d + e = 23 ... 9 d + 9 e = 207

9 d +12 e = 231

subtracting equations (to eliminate d) ... 3 e = 24

solve for e , then substitute back to find d