I assume by starting value, you mean y-intercept. The y-intercept is 15
To find this, we need to use slope intercept form and the given information to find it.
y = mx + b ----> plug in the known values
9 = -3/4(8) + b
9 = -6 + b
15 = b
Therefore, the starting value is 15.
Triangles a are similar because they have the same degrees
And Triangles d are similar because they are the same shape
The answer would be 2 2/3.
