Jika titik (a,-3) dilalui oleh garis y=7-1/2x nilai a adalah….a.4b.5c.10d.20

PGL

y = 7 – (1/2) x
-3 = 7 – (1/2)a
(1/2)a = 10
a = 20

OPTION D

X,y -> a, -3

y = 7 – 1/2 x
– 3 = 7 – 1/2 (a)
– 3 – 7 = – 1/2 a
– 1/2 a = – 10. ( kali -2)
a = 20

Jawab d
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