Question 289437
"algebra proportions' seems a likely category.
Repeating what the other tutor said 
if you work 8 hours for 10 dollars you will get 80 dollars
80=8*10
p=10*h
pay = wage*hours
y=kx
Usually in those direct proportion problem you will be given a sample x and y
so you can find k
then they will either given you n x or y and want the other

John worked 8 hours and earned $64 
the next day he earned $72 
how many hours did he work the second day

inversely proportional
y=k/x
but that is another topic