Ok,
when you are told to work out the gradient and you are given two points. Remember this formula:
\(\displaystyle \frac {y_{1}-y_{2}}{x_{1}-x_{2}}\)
You can also use:
\(\displaystyle \frac {y_{2}-y_{1}}{x_{2}-x_{1}}\)
They both will work.
Your question is: (-3,5) and (4,3)
In this case -3 will be \(\displaystyle x_{1}\) 5 will be \(\displaystyle x_{2}\). 4 will be \(\displaystyle y_{1}\) and 3 will be \(\displaystyle y_{2} \)
Now substitute the values into the formula.