# At what values of x does the function y = f (x) take on values a) greater than 21 b) less than -15 y = -3x

July 25, 2021 | education

| Function: f (x) = -3x. Function value: y.

a) Solve the inequality -3x> 21.

Divide both sides of the inequality by -3. Since we divide by a negative number, the inequality sign changes.

We get x> -7.

b) Solve the inequality -3x <-15.

Divide both sides of the inequality by -3. Since we divide by a negative number, the inequality sign changes.

We get x> 5.

Answer: a) x> -7; b) x> 5.

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