We have the form y = mx + b
Where b is the y intercept and m is the slope of the line
The points (0,2) and (3,0) are on the graph
The slope of the line is [ 0 - 2 ] / [ 3 - 0 ] = -2/3 = "m"
The y intercept is 2
The only equation with a slope of -2/3 and a y intercept of 2 is "H" ⇒ y = (-2/3)x + 2