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2a + b = -2
(-2, 6)
-2a + b = 6
pake cara eliminasi ya
2a + b = -2
-2a + b = 6 (-)
4a = -8
a = -8 : 4
a = -2
substitusi
2a + b = -2
2(-2) + b = -2
-4 + b = -2
b = -2 + 4
b = 2
f(x) = ax + b
f(x) = -2x + 2
(p, -3)
y = -3
f(x) = -2x + 2
f(p) = -2p + 2
y = -2p + 2
-3 = -2p + 2
2p = 2 + 3
2p = 5
p = 5/2
p = 1 1/2
p = 1,5
(-3, q)
x = -3
f(x) = q
f(x) = -2x + 2
q = -2(-3) + 2
q = 6 + 2
q = 8