Question

Solve and graph each solution set.2 s f(x) = 20, where f(x) = 3x - 1

Answer 1

Okay, here we have this:

`2\leq3x-1\leq20`
`\begin{gathered} 2\leq3x-1\text{ and }3x-1\leq20 \\ 3x-1\ge2\text{ and 3x}\leq21 \\ 3x\ge3\text{ and x}\leq7 \\ x\ge1\text{ and x}\leq7 \end{gathered}`

Finally we combine the ranges and obtain:

`1\leq x\leq7`

And, according with this the correct answer is the option A.