Answer:
The points (5,-8) and (7,r) lie on a line with slope 2. To find the missing coordinate r, we can use the slope-intercept form of a linear equation:
y = mx + b
where m is the slope (2 in this case), x is the x-coordinate (7), and b is the y-coordinate (r).
So, we can set up the equation:
2(7) + r = 5 - 8
Simplifying the equation:
14 + r = -3
Solving for r:
r = 17
Therefore, the missing coordinate r is 17.
Explanation: