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# y = mx + c
# y-y1 per y2-y1 = x-x1 per x2-x1
#mencari gradien:
a. klo tegak lurus, brrti => m1 x m2 = -1
b. klo sejajar => m1 = m2 (gradiennya sama)
sebenernya kta guruku, jangan ngapalin rumus, tapi mahamin dek