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I believe the answer is

y = -8

Step-by-step explanation:

how to find slope

Slope Definition:

The slope of a line refers to its direction and steepness.

There are 4 kinds of slope: positive, negative, zero, and undefined. In this guide, we are only going to look at positive and negative slope.

Note that positive slopes increase from left to right and negative slopes decrease from left to right.

The slope of a line is expressed as a fraction that is commonly referred to as rise over run.

The numerator (rise) refers to how many units up or down and the denominator (run) refers to how many units left or right. The direction will depend on whether or not the slope is positive or negative.

Positive Slope: Rise Over Run   Negative Slope: Rise Over Run

Rise: UPWARDS     Run: TO THE RIGHT     Rise: DOWNWARDS     Run: TO THE RIGHT

Step One: Determine if the slope if positive (increasing) or negative (decreasing)

Step Two: Using two points on the line, calculate the rise and the run and express it as a fraction (rise over run).

Step Three: Simplify the fraction if possible.

step-by-step explanation:

x^2 -12x + 36 + y^2 = 36

x^2 + y^2 = 12x

r^2 = 12rcos(theta)

r = 12 cos(theta)