Why are they not congruent?

Because the radius of one is 15/2 and the other is 7

Step-by-step explanation: the radius Is half of the diameter so 15/2 does not equal 7

x=-2

infinite number of lines, so there is an infinite number of equations.

step-by-step explanation:

there are an infinite number of line that passes through the point (-2,5)

x=-2   is one line that passes through the point

y = 5 is another line that passes through the point

(these two lines are perpendicular to each other).

since the number of   numbers are infinite and the slope is the ratio of two numbers,(change in y over change in x) we can have an infinite number of slopes.     our only condition is that it passes through the point (-2,5)

2nd one in the first row is correct