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x+3y-7=0
3y= -x+7
m= -1/3
Rumus :
y - b = m ( x - a )
y - 3 = -1/3 ( x - 1 )
y = -1/3x + 1/3 + 3
y = -1/3x + 3 1/3
x + 3y = x + 3y
x + 3y = 1 + 3(3)
x + 3y = 1 + 9
x + 3y = 10 -------------> x 2
2x + 6y = 20
2x + 6y - 20 = 0
semoga membntu