exam Maths Puzzle Numerical Ability

How do you begin to solve -4x+2y=10 over 6x+2y=10

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exam Other Question

6x-3y=6
y=2x=5 Can you please explain to me step by step how this type of problem is solved.

For f(x) = 2x - 11, find f(2).

I greatly appreciate any help!
Thank you
Patti