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y-2= 2 (x-1)
y-2= 2x-2
y= 2x -2+2
y= 2x
garis2 melalui titik (1,2)
garis2 sejajar dengan garis1, maka m1 = m2 = 2
jawab
y = mx + c
2 = 2. (1) + c
2 = 2 + c
2 - 2 = c
0 = c
jadi persamaan garis y =2x