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3x+5y-15 = 0
5y = -3x+15 (dibagi 5)
y = -3/5x+3
maka m = -3/5
Maka persamaan garis h melalui titik (2,3) melalui gradien m = -3/5 adalah dengan x1 = 2, y1 = 3
=> y-y1 = m(x-x1)
=> y-3 = -3/5(x-2)
=> y-3 = -3/5x+6/5
=> y = -3/5x+6/5+3
=> y = -3/5x+21/5 atau
=> 5y = 21-3x atau
=> 3x+5y-21 = 0
⇒3x + 5y - 15 = 0
5y = -3x + 15
(5y = 3x + 15) : (5)
y = -x + 3
⇒y = mx + c
3 = - (2) +c
3 = - + c
c = - - 3
c = - -
c = -
c = -4
⇒y = -x + -4