exam Maths Puzzle Numerical Ability

I was wondering how you solvea system of euqations problem. The problem is 8x+3y=26
2x=y-4
Thanks fo much for you help = )

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How do you substitute variables if you are doing a double variable questions? I need help with this homeowrk problem. It states: find the inverse of the function f(x)={(-4,-6),(-6,-4),(-5,-3)}