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melewati (-15,4) substitusikan (-15,4) ke persamaan y=4/5x + c, maka didapatkan:
c= y - 4/5x --> c= ( 4 - (4/5 dikali (-15))) --> ( 4 - (-12)) c= 16
maka persamaan garisnya:
y= 4/5x + 16