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f(a) = -8 × a + 5
-7 = -8 × a + 5
-7 -5 = -8a
-12 = -8a
a = -12/ -8
a = 1 1/2. = 3/2 = d
= -8. 3/2 + 5 = -7
=D.
2. 6y -3x + 12 = 0
6y = 3x -12
y = 3/6x -12/6
y = 1/2x -2
m = 1/2 (B)
3. 6x -8y = 18
8y = 6x -18
y = 6/8x -18/8
y= 3/4x -2 1/4
m2= 3/4 x -4/3 = -1
m2 = -4/3
---> y-y1 = m(x-x1)
y -9 = -4/3x -20/3
y = -4/3x -20/3 + 27/3
y = -4/3x + 7/3
3y = -4x + 7
4x + 3y -7 =0 (C)
maaf klo salah