Jonah earns $3 an hour working after school and $4 an hour working on Saturdays. Last week he earned $43, working a total of 13 hours. How many hours did he work on Saturday?

x = amount of hours worked after school

y = amount of hours worked on saturday

x+%2B+y+=+13 or x+=+13+-+y

and

3x+%2B+4y+=+43

plug:

3%2813+-+y%29+%2B+4y+=+43

39+-+3y+%2B+4y+=+43

y+=+4

plug:

x+=+13+-+y

x+=+13+-+4+=+9

9 hours worked after school and 4 hours worked on saturday

Step-by-step explanation:

28

step-by-step explanation:

because that's the answer