I'll do problem 77 to get you started
Point slope form is this general equation
y - y1 = m(x - x1)
with m as the slope and (x1,y1) as the point the line goes through. In this case, m = -4 and (x1,y1) = (-2,9)
Plug those values into the equation to get...
y - y1 = m(x - x1)
y - 9 = -4(x - (-2))
y - 9 = -4(x + 2) see note 1
y - 9 = -4x - 8
y = -4x - 8 + 9
y = -4x + 1 see note 2
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note 1: If your teacher wants the answer in point slope form, then you stop on this line. Otherwise, keep going
note 2: This is in slope intercept form y = mx+b with m = -4 as the slope and b = 1 as the y intercept
