exam Maths Puzzle Numerical Ability

Am having trouble when I have to multiply the whole numbers by the fraactons during some steps that are required to get the values for x and y.
the problem looks something like this
-2x-5y=7
7x+y=-8

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exam Other Question

if the y-intercept is (o, -5) and the slope is undefined then how would you put it in y=mx+b form? How would you classify and graph the following system?

y=x+4
y+x=4

Then, how would you find the solution to this system from the graph?
Thank you!