exam Maths Puzzle Numerical Ability

y=-4x+2
y=100x2

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I cannot figure this out. I tried systems of equations, both substitution and elimination, but could not get it to solve. Thanks

If cd=4 and C^2+d^2=10, what is (c+d)^2 Please help with these.
Graph on a number line: r < - 5

Graph on a number line, where x is a real number: - 4 < x < 6(the 2nd arrow is underlined)

Solve. then graph x + 8 >