book Maths Puzzle Numerical Ability

My question says to solve the system of this inequalitie by graphing.
y-x<0
3y>2x-15 (the > has a line underneath of it.)

I dont know how to solve this or graph it. could y

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book Other Question

Write each equation in slope-intercept form:
1. y + 8 = -3/4 (x + 1)
2. 4x - 2y - 8 = 2y
The vertices of a right triangle are (-12,8), (24,8), and (24,-7). Find the lenght of the hypotenuse of the triangle.