Question

3. Using the equation y = 2x + 5, what would the input need to be for an output of -15?A) -10B) -5C) -25D) -35

Answer 1

A)-10

Step-by-step explanation

Step 1

given the linear function

`y=2x+5`

where x is the independent variable and y is the dependent variable , it means x is the input and y is the output

so

Step 1

to find the input we need to replace the given output in the expression and solve for x

hence, replace and solve for x

let

y=-15

`\begin{gathered} y=2x+5 \\ replace \\ -15=2x+5 \\ subtract\text{ 5 in both sides} \\ -15-5=2x+5-5 \\ -20=2x \\ divide\text{ both sides by 2} \\ -(20)/(2)=(2x)/(2) \\ -10=x \end{gathered}`

therefore, the answer is

A)-10

I hope this helps you