A 11-foot ladder is placed against a vertical wall of a building , with the bottom of the ladder standing on level ground 7 feet from the base of the building. How high up the wall does the ladder reach?

Step-by-step explanation:

Use Pythagorean's Theorem:

'a' and 'b' are the sides while 'c' is the hypotenuse

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)