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m1 = y2-y1/x2-x1
m1 = 2-7/0-(-1)
m1= -5
karena tegak lurus maka gradiennya 1/5
persamaan garis
y-y1=m(x-x1)
y-7 = 1/5 (x-(-1)
y-7 =1/5x+1/5
y= 1/5x+1/5 + 7