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Verified answer
Garis 3x - 5y + 15 = 0 melewati (1,b) dan (a,-2) maka3(1) - 5(b) + 15 = 0
3 - 5b = -15
5b = 3 + 15
5b = 18
b = 18/5
dan
3(a) - 5(-2) + 15 = 0
3a + 10 = -15
3a = -15 - 10
3a = -25
a = -25/3
pertama substitusikan titik (1,b)
3(1)-5(b)+15=0
3-5b+15=0
18=5b
b=18/5
Kedua, substitusikan titik (a,-2)
3(a)-5(-2)+15=0
3a+10+15=0
3a+25=0
3a=-25
a=-25/3