Ok so isolate the y in the second equation.
3x+2y=-9
y=-2x-7
now you know what y has to equal so input it wherever there is a y
3x+2(-2x-7)=-9
try to solve that, if you still need help comment and ill give u the answer
Ok so he just needs to cut it to that length and he gets what he needs.
I am only middle school and I am learning this now I could be wrong but 872,500 -695,000 times 7.25% - 15,078.15 then you may get the answer.