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½ = (a - 1) / (8 - 2)
½ = (a - 1) / 6
6 × ½ = a - 1
3 = a - 1
a = 3 + 1
a = 4
b) m1 . m2 = -1
½ . m2 = -1
m2 = -1 ÷ ½
m2 = -1 × 2 = -2
m = (a - 1) / (8 - 2)
-2 = (a - 1) / 6
-2 . 6 = a - 1
-12 = a - 1
a = -12 + 1 = -11
1/2=1/2
gradien= y2-y1/x2-x1
1/2=a-1/8-2
1/2=a-1/6