Find the value of x and y: 3x-y = 40 , 2x - y = 25.
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3x - y = 40 ------1
2x - y = 25 -------2
(-) (+) (-)
--------------------
x = 15
put x = 15 in 1
3×15 - y = 40
45 - y = 40
- y = - 5
y = 5
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