book Maths Puzzle Numerical Ability

how am i to proof a statement like ab=0

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book Other Question

I am very confused as to how to Solve each system by the additional method. Can someone help me understand this and solve it please?

17.) x + y = 48
12x + 14y = 628
Determine the horizontal and vertical intercepts for the graph defined by the given equation.

y = 8x + 5