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=7-5/4-(-2)
=2/6
=1/3
maka persamaan garis
=>y-y1=m(x-x1)
=>y-5=m(x-(-2)
=>y-5=1/3(x+2)
=>3y-15=x+2
=>-x+3y-15-2=0 (dikali -)
=>x-3y+17=0 atau x-3y=-17