Final answer:
The slope of the line -48 = 2.2 - Sy cannot be determined without a specific value for y.
Step-by-step explanation:
The equation given is -48 = 2.2 - Sy.
To find the slope of this line, we need to write the equation in slope-intercept form, which is y = mx + b, where m is the slope. Rearranging the given equation gives us -Sy = -50.2 and dividing both sides by -y gives us m = 50.2/y.
Since we don't have a specific value for y, we can't determine the exact slope of the line. Therefore, we can't choose between the options a. 2.4 and b. 4.5 as the slope.