tolong bantuannya untuk soal a-eterimakasih

a.
y - y1 = m(x - x1)
y - (-3) = 7(x - 4)
y + 3 = 7x - 28
y - 7x + 3 + 28 = 0
-7x + y + 31 = 0

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b.
-4x + (-1y) = 8
-y = 4x + 8
y = -4x - 8

m = -4

y - y1 = m (x - x1)
y - 5 = -4(x - 8)
y - 5 = -4x + 32
4x + y - 5 - 32 = 0
4x + y - 37 = 0

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c.
-3y + 4x - 9 = 0
-3y = -4x + 9
y = -4/-3x + 9/-3
y = 4/3x - 3

m1 = 4/3

m1.m2 = -1
4/3 . m2 = -1
m2 = -1 . 3/4
m2 = -3/4

y - y1 = m(x - x1)
y - 6 = -3/4 (x - (-6))
4(y - 6) = -3(x + 6)
4y - 24 = -3x - 18
3x + 4y - 24 + 18 = 0
3x + 4y - 6 = 0

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d.
m = y2 - y1 / x2 - x1
m = -6 - (-4) / 9 - 5
m = -2 / 4
m = -1/2

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e.
y = 8x + 7

m1 = 8

m1.m2 = -1
8 . m2 = -1
m2 = -1/8

y - y1 = m(x - x1)
y - 4 = -1/8 (x - 6)
8(y - 4) = -1(x - 6)
8y - 32 = -x + 6
x + 8y - 32 - 6 = 0
x + 8y - 38 = 0

Semoga membantu dan semoga bermanfaat...