Question

if y(x)=4x what is x when y(x)=4?1. 12. 43. 24. 0

Answer 1

1. 1

Explanation

to find the value of x , when y= 4, just replace and isolate x

$f(x)=y$

it means the value of y depends of the value for x

$y=4x$

y=4x, means that the value for y is 4 times the value for x

when y=4

$\begin{gathered} y=4x \\ 4=4x \\ \text{divide both sides by 4} \\ \frac{4}{4}=\frac{4x}{4} \\ 1=x \\ x=1 \end{gathered}$

it means you need input 1 in x to obtain 4 in y