Work out m and c for the line: y = x + 4

I can't tell you the answer, sorry but, I can tell you something

To find the lower bound of , subtract the upper bound of x – y from the lower bound of x. , If each of the numbers is given to two significant figures. The lower bound of the calculation is obtained by subtracting the upper bound of 4.5 from the lower bound of 7.3. Therefore lower bound of (7.3 – 4.5) is 2.7.