solve graphically X + Y is equals to 10 x minus y is equals to 4
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x+y=10----equation 1
x-y=4----equation 2
add equation 1 and 2
x+y=10 + x-y=4
2×=14
×=14/2
×=7
substitute in equation ---1
x=7
so, 7+y=10
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