exam Maths Puzzle Numerical Ability

Please help me solve 2x+y=5 so I can graph it I have an idea but not sure.

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exam Other Question

I need help to find;
The inequalities and identify the variables.
And identify the objective function.
Thank You.

An automobile manufacturer has assembly plants in Detroit an I need help with the steps in solving this problem. It says solve by substitution 3x-5y=41, x-y=11

Thank you,
Brina