Describe the graph of the equation. x=7. is the equation a function

The graph of x = 7 is a straight, vertical line through (7, 0). x = 7 is not a function because a function requires 2 variables. I'm pretty sure this is right.

My guess is A maybe wrong though sorry if is.

horizontal line; yes. is A

step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15