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3y = -2x +20
y = -2/3 x + 20/3
Gardien 1 = -2/3
2y = 3x+6
y = 3/2x + 3
gradien 2 = 3/2
sumbu y maka x = 0
garis 1 2x + 3y -20 = 0
0 + 3y = 20
y = 20/3 (0, 20/3)
garis 2 3x -2y + 6 = 0
0 - 2y = -6
y = 3 (0,3)
sumbu x maka y = 0
garis 1 2x + 0 - 20 = 0
2x = 20
x = 10 (10,0)
Garis 2 3x - 0 + 6 = 0
3x = -6
x = -2 (-2,0
Jadi kedua garis tegak lurus