y - 2x = 7
4y + x = 1
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y - 2x =7 ------(i) × 1
4y + x=1 --------(ii) × 2
y - 2x= 7
8y+ 2x =2
________
9y. = 9
=) y = 9÷9 = 1
Putting the value of y in equation (i)
y -2x =7
=) 1 -2x = 7
=) -2x = 7- 6
=) -2x = 6
=) x = 6 ÷ (-2) = -3
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