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= 2/4
= 1/2
Karena garis a miring ke kanan maka gradiennya negatif yaitu -1/2
ma × mb = -1
-1/2 × mb = -1
mb= -1 × -2/1
mb= 2
Garis b melalui titik P(4,0)
Persamaannya
y-y1 = m(x-x1)
y-0 = 2(x-4)
y= 2x-8 (A)