Question 379092
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Hi,
Note: the slope of the line will be {{{m =(y[2] - y[1])/(x[2] - x[1])}}}
(1-1) (3,9)
m = 9 -(-1)/ 3-1 = 10/2 = 5  
m = 5 OR 5/1
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 = 5x + b  using ordered pair Pt(1,-1) to solve fo b
-1 = 5 + b
-6 = b
y = 5x -6  Pt(0,-6) and Pt(6/5,0) on the line
Note as y increases/decreases by 5, x increases/decreases by 1
{{{drawing(300,300, -6, 6, -6, 6, grid(1),
circle(0, -6,0.3),
circle(6/5, 0,0.3),
graph( 300, 300, -6, 6, -6, 6,5x - 6))}}}