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4x-7y-5=0, a=4, b=-7
maka gradien : -4/-7 = 4/7 (b)
9) pakai rumus y-y1/y2-y1 = x-x1/x2-x1
dimana (x1,y1) (-2,2) dan (x2,y2) (2,7)
maka
y-2/7-2 = x+2 / 2+2
y-2 / 5 = x+2 / 4
4y-8 = 5x+10
4y = 5x+18 (b)
10) (tidak kelihatan soalnya)