Hi,         

Using the point-slope formula, 

    (-1,1),(3,9)

m =  9-1  /3-(-1) = 8/4 = 2/1

Using the standard slope-intercept form for an equation of a line y = mx + b 

 where m is the slope and b the y-intercept. 

 y = 2x + b Using ordered pair(-1,1) to solve for b

 1 = 2(-1) + b

 3 = b

Equation of the line is:

 

 (1,m) would be (1,5)

  y = 2*1 + 3

 (n,13)would be (5,13)

 13 = 2x + 3

 10  = 2x

  5= x 

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