exam Maths Puzzle Numerical Ability

The sum of two mubers is 36. Their difference is 12. What are the two numbers?

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exam Other Question

at what point do the lines 5x+y=19 and -x+2y=-6 intersect I tried and got the answer (4,-1) Solve the system by graphing and then get an exact solution by using either substitution or elimination :

2x - y = -1

6x + 3y = 0