exam Maths Puzzle Numerical Ability

Solve the system by the elimination method.
5x + 2y = -7
7x - 3y = 19
What is the solution to the system???
I really do not understand these how to do these? Can someone please help??

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exam Other Question

Whats 60 kilometers in 1.5 hours average speed? The question is not to simplify 18 - 7 - 6 -4 but to get the condition under which the sum of a positive number and several negative numbers will be positive.

Can we use t