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m = y' = 4x -3 = - 1/5
4x = 14/5
x = 7/10, y = - 3/25
.
pers gasing -> y = - 1/5 (x - 7/10) - 3/25
y = -1/5 x + 7/50 - 3/25
50 y = -10x + 7-6
10x + 50 y - 1= 0