exam Maths Puzzle Numerical Ability

How do I solve the following system of linear equation

5x + 4y = 40

x + 2y = 11

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exam Other Question

Please help me---I am not sure how to setup this problem in order to solve it.
Problem: Find the greatest possible pair of numbers such that one integer is 5 more than twice the other and the sum is less than 30. draw and label a figure that has two congruent segments and three congruent angles mark the congruent angles and the congruent segments.