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y = 2x + 5 --> gradien m1 = 2
m1 ⋅ m2 = -1
2 ⋅ m2 = -1
m2 = − 1/2
maka :
y - y1 = m(x - x1)
y - 1 = 1/2(x - 3)
y - 1 = 1/2 x - 3/2
y = 1/2 x - 3/2 + 1
y = 1/2 x - 1/2
2y -u = 2y - u
2y -u = 2(1) - 3
2y -u = 2-3
2y-u = -1