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Answer:
y = -1/3x +5
Explanation:
The graph crosses the y-axis at y=5, so that is the y-intercept.
The graph crosses the next grid line intersection point 3 units to the right and 1 unit down, so the slope is ...
m = rise/run = -1/3
The slope-intercept equation is then ...
y = mx + b . . . . . for slope m and y-intercept b
y = -1/3x + 5