Answer:
the equation of the line is,
y = -x + 9
Explanation:
let's take any two x, y co - ordinates from the given graph:
x1, y1 = 8, 1
x2, y2 = 4, 5
equation of the line is, y = mx + b
where slope, m = y2 - y1 / x2 - x1
= 5 - 1 / 4 - 8 = 4/-4 = -1
let's take x1, y1 as x, y co - ordinate to find the value of constant, b
1 = (-1)(8) + b
1 + 8 = b
b = 9
thus, the equation of the line is,
y = -x + 9