M: That was extra maths
E. Loved it, but quite easy. Here's my problem for you. Hope you know about graphs.
The image above contains a hidden question. Please enter your answer to the question in the box below. If the answer is a number please enter it using numerals rather than words.
To deter guessing without thinking, we ask that you also solve the following simple arithmetic problem before checking your answer:
If x = 7, y = 4 and z = 9, what is x × y - z?