exam Maths Puzzle Numerical Ability

If f(x) = x + 2/3, then the value of f(0) equals.

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exam Other Question

Find the slope and the y-intercept.
y = 4x - 2

The answer I came up for this one is 2 for the slope. Is this correct? If not could you show me what I did wrong and explain how to find the slope and y-intercept. Thanks for your time and help.
Find the slope of the line

y =3