Bantu ngerjain tugas

4) -15x+4y = -60
4y = 15x -60 (B)
5) 5x+y-7=0
y=-5x+7
m= koef x = -5 (B)
6)y-y1/y2-y1 = x-x1/x2-x1
y-2/-4-2 = x-3/6-3
y-2/-6 = x-3/3
3(y-2) = -6 (x-3)
3y-6 = -6x+18
6x+3y-24=0 (D)
7)y-y1 = m(x-x1)
y-3 = 2(x-2)
y-3 = 2x-4
y=2x-1 (B)