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What is the rule for the reflection?

When you reflect a point across the line y = x, the x-coordinate and y-coordinate change places. If you reflect over the line y = -x, the x-coordinate and y-coordinate change places and are negated (the signs are changed). the line y = x is the point (y, x). the line y = -x is the point (-y, -x).

Step-by-step explanation:

Hope you understand

the formula of a slope:

we have the points (-2, 7) and (2, 3). substitute:

noncoplanar points are points that do not lie on the same line.