exam Maths Puzzle Numerical Ability

add or substitute this problem I do not know how or which to do Can you help? 10x+2y=7 y=5x+3

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Could someone help me on this problem?

I need to evaluate the following problem.

4- (-3) + 1/1-1 divided by (-2)

Thanks,
Lyn write the equasion of the line which passes through point (2,1) and is parallel to the line with equasion y=5/2x+6