exam Maths Puzzle Numerical Ability

How do you substitute variables if you are doing a double variable questions?

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exam Other Question

Which equations is undefined

A) y=4

B) y=-2x

C) x=4

D) y=x+4
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 = )