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gradien = m
kita tau gradien yang dicari di opsi itu harus 1/5, cek satu-satu, bentuk ke dalam y = mx + c
5x - y = -23
5x - 5x - y = -23 - 5x
-y = -5x - 23
y = 5x + 23
m = 5 (salah)
x - 5y = 37
x - x - 5y = 37 - x
-5y = 37 - x
5y = x - 37
y = (1/5)x - 37/5
m = 1/5 (benar)
x + 5y = -37
5y = -x - 37
y = -(1/5)x - 37/5
m = -(1/5) (salah)
5x + y = 11
y = -5x + 11
m = -5 (salah)