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-5y = -2x -20
-5 -5
y = 2 x - 20
5
Gradien = 2
5 ( D )....
5y=-2x-20
y= -2/5x-20/5
gradien 1= -2/5
gradien tegak lurus=m1×m2=-1
-2/5×m2=-1
m2=5/2