book Maths Puzzle Numerical Ability

please solve this for x and y:

y = -4 + 4
y = -x - 5

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book Other Question

I need help on answering this quadratic problem Please. 6r
square + 24r+15. Please give details on how to solve it. Thanks 2/3 is to 3/4 as X is to 21/24 ?

I had a bunch of other questions similar to this one but they were all decimals. I don't no why but im banging my head over what I know is an ea