Answer: (0, 48)
Explanation:
To find the y-intercept, plug the x and y values in the equation y = -3x + b, and leave the b the same.
I will use (11, 15)
15 = -3(11) + b
15 = -33 + b
48 = b
The y-intercept is (0, 48)
Equation is y = -3x + 48
Hope this helps!