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y=2x+1, gradiennya 2
sejajar, maka gradiennya sama (m=2)
y-y1=m(x-x1)
y+1=2(x-4)
y+1=2x-8
y=2x-8-1
y=2x-9
b.
2y-x-3=0
2y=x+3
y=1/2x+3/2, gradiennya 1/2
sejajar, maka gradiennya sama (m=1/2)
y-y1=m(x-x1)
y+1=1/2(x-4)
2y+2=x-4
2y-x=-4-2
2y-x=-6