Write the equation of the vertical line that passes through the point (−2, 10). remember to enter your answer as an equation.

Remark
All vertical lines are of the form x = a. The y value only places where the point is on the grid. 

For this particular question the x value of the point is where the vertical line is. At x = -2 draw a vertical line. The graph shows what this looks like.

The graph (x = - 2) is in red.

The point (-2,10) is green.

320 girls x 0.2 lh probability = 64 lhg
250 boys x 0.1 lh probability = 25 lhb
Total is the sum of the two 64+25 = 89