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5y = -3x + 15
-------------- : 5
y = -3/5x + 15
m = -3/5
y - y1 = m (x - x1)
y - 3 = -3/5 (x - 2)
y - 3 = -3/5x + 6/5
--------------------*5
5y - 15 = -3x + 6
3x + 5y = 6 + 15
3x + 5y = 21 (c)
5y = -3x + 15
y = -3/5x + 15
m = -3/5
y - y1 = m (x - x1)
y - 3 = -3/5 (x - 2)
y - 3 = -3/5x + 6/5
5y - 15 = -3x + 6
3x + 5y = 6 + 15
3x + 5y = 21
jadi,jawabannya yang (C)