exam Maths Puzzle Numerical Ability

1-solve by graphing x-y=5

2- x+y=3

3- x+2y<_ 3

4-x+y> 2

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exam Other Question

Can you teach me how to solve this problem.
The sum of three numbers is 105. The third is 11 less than ten times the second. Twice the first is 7 more than three times the second. Find the numbers. Systems of equations can be solved by graphing or by using substitution or elimination. What are the pros and cons of each method? Which method is the best? Why? What circumstances