Answer: y = 1/9x + 14/9
Step-by-step explanation: y = ax + b, slope formula (y2 - y1)/(x2 - x1) put the points in the formula so the slope is -1/-9 = 1/9, y = 1/9x + b put (4,2) in the equation then it would be 2 = 5/9 + b so b is 14/9. So the answer is
y = 1/9x + 14/9 ( / is a same meaning as divide)