exam Maths Puzzle Numerical Ability

Could you please help me with this question?
Solve:
1.5X - 2Y = 0
3X - 4Y = 7
Thank you.

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exam Other Question

1.find perimeter of a square with diagonal of 12 centimeters
2.find the diagonal of a square with a perimeter of 20 inches
3.find the diagonal of a square with a perimeter of 28 inches Finding (f*g)(x) and (g*f)(x) and the domain of the following.

f(X)= squared root of x+1
g(x)= squared root of x-1