book Maths Puzzle Numerical Ability

I am needing help with the following problem please...

Find the slope of the line passing through (7,3) and (9,-2)
A. 2/5
B. -2/5
C. 5/2
D. -5/2

Thank you in advance for your help.

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book Other Question

wat is the formula for the area of a rectangle Let T, U: V to W be linear transformations. Prove that:
a. R(T+U) is a subset of R(T)+R(U).
b. If W is finite-dimensional, then rank(T+U)=< rank(T)+rank(U).
c. Deduct from b that rank(A+B)=< rank(A)+rank(B) for any m x n matrices
A and B.