exam Maths Puzzle Numerical Ability

I have to find how to work the problem so that x is the function of y.
1/2*y-7=3x

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exam Other Question

I have been working on these questions and cannot get the answer. Could you kindly help me.

1. a^2-a= -a ( ) complete the factorization of each binomial

2. t^2 - 9w^2 Factor polunomial completely

Thank you kindly. solve the following system of linear equations and if possible express the answer as an ordered pair

3x-5y=1
10y=6x-1