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y - y1 = x - x1
y2-y1 x2-x1
y - 3 = x - (-2)
-3 -3 1-(-2)
y - 3 = x + 2
-6 3
3y - 9 = -6x - 12
3y = -6x - 12 + 9
3y = -6x - 3
y = -2x - 1
masukkan nilai 4 ke x di persamaan
y = -2(4) - 1
y = -8 - 1
y = -9
jadi nilai a = -9