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y-y1(x-x1) y=5kx+3 y=9k(x-x1) y=4x+b
k>﹣1 k<﹣1 k≥﹣1且k≠0 k>﹣1且k≠0
k>-1 k<1且k≠0 k≥-1且k≠0 k>-1且k≠0
3y-y1=x-x1 y=3kx+b-2 y-y1=k(x-x1) y=ax -4
y-y1=k(x-x1) y=5kx+3 y=9k(x-x1) y=4x+b
y-y 1=k(x-x 1) y=5kx+3 y =9k(x-x 1) y=4x+b
k≥-1 k≥-1且k≠0 k≤1 k≤1且k≠0
y-y l =k(X-X 1) y=5kx+3 Y=9k(x-x 1) y=4x+b
y-y1=k(x-x 1) y=kx+8 y=4kx y=ax+b