The question is worded as follows:
find the midpoint (a,b) between the two points (-5,5),(-4,2).
Then it has two answer fields. one for A= and another for B=. How am I supposed to answer this?
The midpoint betweens two others is defined as the one with equal distance to both. That would mean that if $\displaystyle X=(-5,5)$, $\displaystyle Y=(-4,2)$ and $\displaystyle M$ is the midpoint between those, we have:
$\displaystyle d(X,M) = d(Y,M)$
Since this is $\displaystyle \mathbb{R}^2$, the midpoint would be middleway the line connecting $\displaystyle X$ and $\displaystyle Y$.