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x=2
3y=6x-9
3y=6(2)-9
3y=12-9
3y=3
y=1(A)
2. PG yg melalui titik(3,4)//2y+4x=8
m=-a/b
m=-4/2
m=-2
y-y1=m(x-x1)
y-4=-2(x-3)
y-4=-2x+6
y=-2x+6+4
y=-2x+10
atau
2x+y=10(A)
3.PG yg tegak lurus dgn garis y=x melalui titik(4,-8)
m×m2=-1
m=x/y
m=1
m×m2=-1
1×-1=-1
y-y1=m(x-x1)
y-(-8)=-1(x-4)
y+8=-x+4
y=-x+4-8
y=-x-4(B)
maaf kalau salah & semoga membantu:)