The lines given by the equation y = 9 - 1/3x and y = mx + b are perpendicular and intersect at a point on the x axis. What is the value of b?

• Since these lines are perpendicular, their product of their gradients is negative one:

• m1 is gradient of first line.

• m2 is gradient of second line.

• since they intersect at a point on x-axis, y = 0

• Considering the first line: y = 9 - ⅓x

point is (27, 0)

• Considering the second line: y = mx + b

answer: 0.95, d

step-by-step explanation:

first, you have to combine the percentages of costumers ordering pizza or salad. 25% (percent of salads ordered) plus 70% (percent of pizzas ordered) is equal to 95%. then, turn 95% into a fraction: 95/100. lastly, divide 95 by 100 and you will get 0.95, d.