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x=8

2(8)-5=11

8+3=11

Q =  number of questions answered (the dependent variable)
M = minutes (the independent variable)

Therefore a linear relation between M and Q is of the form
Q = m*M + c
where m =  the slope or the rate of questions answered per minute.

Because no questions are answered to begin, c = 0
The rate at which questions are answered is 1/2 questions per minute, therefore m = 1/2.

The relationship is
Q = (1/2) x M

Q = (1/2) x M