exam Maths Puzzle Numerical Ability

identify the slope (m) and y-intercept (b) for the line that could be graphed for each given linear equation.
y+2x=0

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exam Other Question

Please help me with the following. Thanks in advance.

sqrt of x-2=1

sqrt of x^3=27

3^sqrt x^2=9

Is (sqrt of x)^2 an identity (true for all nonnegative values of x)?
y=4x
4x+5y=-24