Answer:
y = x - 3
Explanation:
Consider the equation "y = mx + b" :
y = mx + b
Since the slope is 1, you could input that into the equation:
y = (1)x + b
The variable "b" represents the y-intercept, therefore, to find the y - intercept, you would have to subtract 7 from each side of the coordinate points to get 0 as the x - coordinate to find the y - intercept:
(7 4)
-7 || -7
(0, -3)
Therefore, the y - intercept would be -3 and the equation would be:
y = x - 3