2. Sam has two part-time jobs, delivering pizza and mowing lawns. He makes $9/hr delivering pizza and $7/hr mowing lawns. Last week he worked a total of 32 hours and made $248. How many hours did he work at each job

Step-by-step explanation:

let the jobs be x and y, so that

x+y=321

9x+7y=2482

x=32-y

substitute x=32-y for x in equation 2 we have

9(32-y)+7y=248

open bracket we have

288-9y+7y=248

-2y=248-288

-2y=-40

2y=40

divide both sides by 2 we have

y=40/2

y= 10 hours

subtitute y=10 for y in equation 1 to find x

x+10=321

x=32-10

x=22

x=22 hours

KN= 15 units

NM= 20 units

Step-by-step explanation: