Explanation: Slope of the line can be calculated using the following rule: slope = (y2-y1) / (x2-x1)
We are given : slope = 1/8 point (u,-9) represent (x1,y1) point (6,-8) represent (x2,y2)
Substitute with the givens in the above equation and solve for u as follows: slope = (y2-y1) / (x2-x1) 1/8 = (-8--9) / (6-u) 1/8 = (1) / (6-u) 1* (6-u) = 1*8 6-u = 8 u = 6-8 u = -2
There are 4 boys and 12 students in total. It would be 4/12, but if it was to be simplified, it would be 1/3. The probability of a boy being selected is 1/3.