exam Maths Puzzle Numerical Ability

Solve the system by the elimination method
5x+3y=-7
7x-2y=19

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exam Other Question

find the x-intercept and the y-intercept of the graph of the equation

y-2x=3 A certain kind of wood weighs 0.85 g per cubic cm. An 18cm by 12cm by 10cm block of that wood is floating in water. Approximately what weight of water does the block displace?