Question

State whether each equation or function is linear. Write yes or no. If no, explain your reasoning.

$21.f\left(x\right)=7x^5+x-1$

Short answer

No, the function $f\left(x\right)=7x^5+x-1$ is not a linear function.

Step-by-step solution

– Definition of a linear equation and linear function.

In a linear equation the exponent of each variable is 1 and the variables may not be multiplied together. The graph of a linear equation is always a line.

In a linear function, each input value has a unique output value. In other words, for each point in domain, there is a unique value in the range of function. It can be written as $f\left(x\right)=mx+b$, where m and b are real numbers.

– Given information.

The given function is:

$f\left(x\right)=7x^5+x-1$

– Check whether the equation is linear or not.

In the given function the highest exponent of x is 5.

The function $f\left(x\right)=7x^5+x-1$is not a linear function because x has an exponent other than 1.

Thus,the required answer is “No” because the function $f\left(x\right)=7x^5+x-1$ is not a linear function.