X-2y=0 ,3x+4y=20 solve the following equations graphically
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x-2y=0
X 2 4 -2
Y 1 2 -1
(X,Y)(2,1)(4,2)(-2,-1)
3x+4y=20
X 4 0 6
Y 2 5 1/2
(X,Y)(4,2)(0,5)(6,1/2)
therefore (X,Y)=(4, 2)
as the lines intersect at this point
X 2 4 -2
Y 1 2 -1
(X,Y)(2,1)(4,2)(-2,-1)
3x+4y=20
X 4 0 6
Y 2 5 1/2
(X,Y)(4,2)(0,5)(6,1/2)
therefore (X,Y)=(4, 2)
as the lines intersect at this point
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