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2y= -4x-5
y = -2x-5/2
m1 = -2
m1=m2
m2= -2
y= -2x + c
melalui titik (2,-3)
-3 = -2 .2 + c
c = 4-3
c= 1
persamaan garis : y= -2x + 1
2. 3x-2y = 14
2x+ y = 0 I x2
.....................
3x - 2y = 14
4x + 2y = 0
......................+
7x = 14
x= 2
2x = -y
4 = -y
y = -4
3x - 4y = 6 - 4 ( -4)
= 6+ 16
= 22