book Maths Puzzle Numerical Ability

how do you solve this system of equation:
y=-2x^2+8x+27
2x+y=15

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book Other Question

when Y=6

5y or y+19 The upper Angel Falls, the highest waterfall on Earth, are 750 m higher than
Niagara Falls. If each of the falls were 7 m lower, the upper Angel Falls
would be 16 times as high