- #1

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## Homework Statement

dy/dx +y=x

## Homework Equations

none

## The Attempt at a Solution

We know that x is the independent variable because y is differentiate with respect to it. And y is the dependent variable. Just wondering do you guys know why y is always a function of x in these kinds of differential equation? I got confuse when somebody write like dy(x)/dx+y(x)=x. How do you know y is

**always a function of x**?

Thank you