Question 391335
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Hi,         
Using the point-slope formula, {{{m =(y[2] - y[1])/(x[2] - x[1])}}}
    (-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:
 {{{ y = 2x + 3}}}
 (1,m) would be (1,5)
  y = 2*1 + 3
 (n,13)would be (5,13)
 13 = 2x + 3
 10  = 2x
  5= x