show that the points A - 1, 1 5 7 and 8, 10 or collinear
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1/2[-1(7-10) +5(10-1) +8(1-7) ]
1/2(-1×-3+5×9+8×-6)
1/2×(3+45-48)
1/2×(48-48)
0
1/2(-1×-3+5×9+8×-6)
1/2×(3+45-48)
1/2×(48-48)
0
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