Answer only please attachment below

The equation of the line is y = -x + 9.

Step-by-step explanation:

First, you have to find the gradient by choosing any 2 coordinates that lies on the line. I will choose (0,9) and (9,0). Then you have to substitute it the the formula.

Next, you have to put into the slope-form equation, y = mx + c where m represents gradient which is -1 and c is y-intercept. In order to find c in a faster way, you can look at the graph to see which coordinates touches y-axis. So the value of c is 9 :

do you have the measurements?

fist on the left goes with the third on the right. second on the left goes with the fourth on the right. third on the left goes with the second on the right. the fourth on the left goes with first on the right