exam Maths Puzzle Numerical Ability

Please help I do not understand this stuff.

True or false: The function "f(x) = 3x" grows three times faster than the function "g(x) = x". Explain why.
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exam Other Question
if x a nail can be brought for 6p write down the cost of y nails. Which of the ordered pairs
(3, 1), (0, -4), (-4, 0), (-3, -7)
are solutions for the equation x - y = 4?


Thanks!