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The equation of the lines is
x + 2y = 7
And
x - y = 4
Then the value of x = 5 and the value of y = 1
Putting the value,
First Equation :
= x + 2y = 7
= 5 + 2(1)= 7
= 5 + 2 = 7
Second Equation :
= x - y = 4
= 5 - 1 = 4
Hence, proved !
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