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y2-y1 u2-u1
maka
y - 1 = u -2
-7-1 -2-2
y-1 = u - 2 dikali silang
-8 -4
-4y +4 = -8u +10
-4y = -8u +10 -4
-4y = -8u +4 di sederhanakan bagi 4
-y = -2u + 1
atau
-y + 2u = 1
atau
-y + 2u -1 = 0