Question

I need help with problem.

Answer 1

`y=5-2x`

Explanation:

You have to give the equation in the form
`y=mx+c`, where m is the gradient and c is the y-intercept (where the line crosses the y-axis).

From the graph, we can see the line crossed the y-axis at (0,5), so the y-intercept is (0,5), which means c is 5.

We can work out the gradient with the two points (2,1) and (1,3) by doing:

`(change in y)/(change in x) =(1-3)/(2-1)=-2`
So the gradient of the line, m, is -2.

Thus the equation of the line is
`y=5-2x`.