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y = -5x + 3
berarti m1 = -5
karna sejajar, m2 = m1 = -5
y = x^2 + 7x - 8
y'= 2x + 7
2x + 7 = -5
2x = -12
x=-6
y= x^2 + 7x -8
y= (-6)^2 + 7(-6) - 8
y= 36 - 42 - 8
y= -14
titik (-6,-14)
PGS:
y-y1=m(x-x1)
y-(-14) = -5(x-(-6))
y+14=-5(x+6)
y+14=-5x-30
y=-5x-30-14
y=-5x-44 atau bisa juga y+5x=-44