exam Maths Puzzle Numerical Ability

3x+4y=2
x-y=1

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exam Other Question

Could someone help me with this problem please:solving for x 7x=3
This an example of one I did: 3X=81
3X (3)^4
X=4 Thank you in advance Elle J 2) -3/8 ≤ -1/4x + 1/8 < 5/8