99X+101Y=429 101X+99Y=501
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99x+101y=429
101x+99y=501
on adding we get a new equation
200x+200y=930
99x+101y=429
101x+99y=501
on subtracting we get a new equation
-2x+2y=-72
we get 2 equation now solve
200x+200y=930
(-2x+2y=72)100
200x+200y=930
-200x+200y=7200
400y=8130
y=8130/400
now u can sovle for x
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