2x+5y=20,........(1) 7x+5y =10 ......... (2)
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solving equation 1 and 2
2x+5y=20
7x+5y=10
- - -
-5x =10
x=-10/5
x=-2
substituting the value of x in equation 1
-4+5y=20
5y=20+4
5y=24
y=24/5
y=4.8
x=-2
y=4.8
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