You can put this solution on YOUR website! P(-3,3) and slope m=-4/3
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I know 2 ways to do these.
1st method
y-y1 = m*(x-x1) where (x1,y1) is the point
y-3 = (-4/3)*(x+3)
y-3 = (-4/3)x - 4
y = -4x/3 - 1
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2nd method
y = mx+b
3 = (-4/3)*-3 + b
b = -1
y = -4x/3 - 1