The right equation of the red line will be f(x)=y-4 if the equation of the black line is f(x)=y
What is the equation?
The equation is like a relationship between variables.
What is a variable?
A variable is anything which have a value.
How to form an equation?
If we see the points of red line and the lack line we can see the value of x in black line is 4 greater than red line so the equation will be
f(x)=y-4 for the red line for the given equation of the lack line which is f(x)=y
Learn more about variables at https://brainly.com/question/2804470
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