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4y+3x=-14 |x3 | 12y+9x=-42
_______________________ _
-17x=-34
x=2
3y-2x=-19
3y-2(2)=-19
3y-4=-19
3y=-19+4
3y=-15
y=-5
titik potongnya (2,-5)
persamaan garis tegak lurus pada 5x+4y=20
m=4/5
y-y1=m(x-x1)
y-(-5)=4/5(x-2)
y+5=4/5x-8/5
y-4/5x=-8/5-5
y-4/5x=-33/5
___________ x5
5y-4x=-33