Remark
What you are trying to do is isolate the y value. Then you just interpret what you found.
Equation
-9x + 10y = - 9
Solve
x and y must be on opposite sides of the equal sign. Add 9x to both sides.
10y = 9x - 9 Divide by 10
y = 9x/10 - 9/10
There's the equation. Now all you need do is interpret it.
Meaning
The general equation for this situation is
y = mx + b
m (the number in front of the x) is the slope
y = 9/10 x - 9/10
So the slope is 9/10
b is the number by itself on the right. It is the y-intercept and it it -9/10
Since slope is greater than 0, C cannot be right.
Since the y intercept is less than 0, A, B, and C are all incorrect which leaves D
Answer D