Answer:
The y-intercept is (0,-26)
Step-by-step explanation:
Given two points P(a,b) and Q(c,d), the line that passes for both points can be found with the expression

We'll take the first two points P(34,-52) and Q(51,-65) to find

Let's verify if the third point is on the line:

It belongs to the line. To find the y-intercept of the line, we set x to 0

The y-intercept is (0,-26)