Question

Solve the inequality and graph the solution.
9+3n<
–
9
To draw a ray, plot an endpoint and select an arrow. Select an endpoint to change it from closed to open. Select the middle of the ray to delete it.

Answer 1

Solve: 9 + 3n < −9

Subtract 9 from both sides:
3n < −18

Divide by 3:
n < −6

Solution: n < −6

Interval notation: (−∞, −6)

Graph: on a number line put an open circle at −6 and draw a ray/arrow extending to the left (toward −∞) to show all numbers less than −6.