exam Maths Puzzle Numerical Ability

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

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Hi I need help with this
6 - 3|2x + 6| = 0
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