exam Maths Puzzle Numerical Ability

what is (y+4)(y-1)=0

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exam Other Question

There are 7 girls in the bus, each girl has 7 backpacks, each backpack has 7 big cats, for each big cat there are 7 little cats.

How many legs are on the bus? Plot the graph of the following equations 2x + 4y = 10 and 3x + 6y = 12 and interpret the result.