C. (3) dan (4)
syarat tegak lurus = m1 × m2 = -1
(3) 2y = x + 5
= y = 1/2x + 5/2
m1 = 1/2
(4) 2x + y = 4
= y = -2x + 4
m2 = -2
m1 × m2 = 1/2 × - 2 = -1 (saling tegak lurus)
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C. (3) dan (4)
syarat tegak lurus = m1 × m2 = -1
(3) 2y = x + 5
= y = 1/2x + 5/2
m1 = 1/2
(4) 2x + y = 4
= y = -2x + 4
m2 = -2
m1 × m2 = 1/2 × - 2 = -1 (saling tegak lurus)