1) find an equation of the line that passes through thr pair of points (-5,-9) and (2,-7).

second question (diff question)

2) find and equation of the line that passes through the pair of points (3,-10) and (0,11).

1: Assuming this line is linear, the first thing to do is find the slope. 
The slope formula is , so in this case, it is , which comes to . Then, use your slope and one of the points given to write the point-slope formula of the linear equation, and then written in standard form:
y=x-.

2. Use the same process as in question 1 to find:
y=-7x+11

The answer would be 54.2%.