Identify the coordinates of P(–5, 7) after a rotation of 180° about the origin. a. P’ = (5, 7) c. P’ = (5, –7) b. P’ = (–5, –7)
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Find the slope of the line first using 
(3, 4), (2, -1)
= 5
Now use y - y1 = m(x - x1) to make an equation in slope-intercept form. Plug the numbers into the formula.
y - (-1) = 5(x - 2)
y + 1 = 5x - 10
y = 5x - 11
The equation of the line in slope-intercept form would be y = 5x - 11.
(3, 4), (2, -1)
Now use y - y1 = m(x - x1) to make an equation in slope-intercept form. Plug the numbers into the formula.
y - (-1) = 5(x - 2)
y + 1 = 5x - 10
y = 5x - 11
The equation of the line in slope-intercept form would be y = 5x - 11.