An equation for the graph would be:
y = -3x + 10
From the point (0,10), the line decreases by 3 units vertically (representing -3) and increases by one unit horizontally (representing 1). Because slope is written as rise/run, our slope would be -3 because -3/1 = -3. The y-intercept, when looking at the initial point crossing the y-axis, would be 10.
Therefore, the equation is:
y = -3x + 10