Find an equation for the line below

Look at the dotted points  on the line in your graph. check their coordinates, for your ease i am attaching a picture, please have a look.

so the two coordinates we have is : ( 3 , 1 ) , (- 1 , - 5)

Now let's find the gradient from these two coordinates.

Now we use the equation of a straight line and here , you can use any of the coordinates. For my ease, I am using the first one:

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step-by-step explanation:

sorry no step by step