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what is the measure of the sectant cd?

How do i do this activity, is appreciated

What is the reflection image of (5,-3) across the line y = -x?

Lindsay used two points, (x,y; ) and (+2.82), to find the equation of the line, y = mx + b, that passes through the points. y2-y, first, she used the definition of slope and determined that the value of mis x, - . given this information, which expression must represent the value of b?