exam Maths Puzzle Numerical Ability

A system of linear equations has solutions (1, -1) and (-2,3).

a)Can you find another solution?
b)How many solutions must exist?

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exam Other Question

Can someone explain the basic principles for the substituion method? I would like to know what can make it easier to understand if at all possible. Thanks! At Jones Realty each sale of a house results in 6% of the selling price being paid to the business. The selling agent then receives 60% of that amount as commission. If an agent sells a house for $225,000, what is the commission on the sale?