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3. cari m dari pers garis 4x + 5y + 6 = 0
5y = -4x - 6
m = -4/5
m2 = -4/5
x1, y1 = 2, -3
y - y1 = m(x - x1)
y + 3 = -4/5(x - 2)
y + 3 = -4/5x + 8/5 **kali 5**
5y + 15 = -4x + 8
4x + 5y + 15 - 8 = 0
4x + 5y + 7 = 0 (B)
4. m = 3
x1, y1 = 1, 5
y - y1 = m(x - x1)
y - 5 = 3(x - 1)
y - 5 = 3x - 3
y = 3x - 3 + 5
y = 3x + 2 (D)
5. m = -5
x1, y1 = 2, 3
y - y1 = m(x - x1)
y - 3 = -5(x - 2)
y - 3 = -5x + 10
5x + y = 10 + 3
5x + y = 13 (B)
6. y = -3x + 2
memotong sumbu y => x = 0
y = -3(0) + 2
y = 2
(x,y) = (0,2) (B)
7. x1, y1 = 5, -3
x2, y2 = 3, -8
m = (y2-y1)/(x2-x1)
m = (-8+3)/(3-5)
m = -5/-2
m = 5/2 (A)