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Verified answer
Jawaby = x - √x
atau
y = x - x^(1/2)
m = y' = 1 - 1/2 x^(-1/2)
untuk x = 4
m = 1 - 1/2 (4)^(-1/2)
m = 1 - 1/2 (2⁻¹)
m = 1 - 1/2(1/2)
m = 1 - 1/4
m = 3/4
Pers gasing di (4,2) dengan m = 3/4
y - y1 = m ( x - x1)
y - 2 = 3/4 (x - 4)
4(y-2) = 3( x- 4)
4y - 8 = 3x - 12
4y = 3x - 5
y = 3/4 x - 5/4