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a. 2x - 3y = 10
<=> 2x - 10 = 3y
<=> 3y = 2x - 10
<=> y = 2/3x - 10/3
m = 2/3
gradien garis yang sejajar : m1=m2=2/3
b. 3x + 4y = 5
<=> 4y = -3x + 5
<=> y = -3/4x + 5/4
m = -3/4
tegak lurus : m1.m2=-1
m2 = -1/m1
m2 = 4/3
Semangat belajar.. ^_^