Запишите уравнение прямой CD, если C (-3 1) D(-5 9)
y=kx+b
1=-3k+b => b=1+3k
9=-5k+b => 9=-5k+1+3k
-2k=8
k=-4
b=1+3*(-4)=-11
y=-4x-11
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y=kx+b
1=-3k+b => b=1+3k
9=-5k+b => 9=-5k+1+3k
-2k=8
k=-4
b=1+3*(-4)=-11
y=-4x-11