exam Maths Puzzle Numerical Ability

please help me solve this problem.

graph and check to solve the linear system.

-x+y=3
x+y=5

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exam Other Question

Antonella bought some calculators for a total of $240. She kept one for herself and sold the rest for $300 making a profit of $5 on each calculator. How many calculators did she buy?

an equation for this pls?? anyone?? The square of a number decreased by 2 is equal to the negative of the number. Find the number.