17.
The point-slope form:

We have slope=m=8, and the point (-5, -3). Substitute:

18.
The formula of a slope:

We have the points (3, 4) and (15, 10). Substitute:

The point-slope form:

or

Answer:
it is a vertical line going up at -2 on the x-axis
Step-by-step explanation:
C. Infinitely many of solutions
A straight horizontal line where the y-intercept is -3
It is given in the question that
After being discounted 40%, a weather radio sells for $35.97.
It means the weather radio sells at a 60% of original price.
Let the original price be $x.
Therefore according to the question,

Therefore the original price of the weather radio is $59.95.