Hi,

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.

1) y-intercept of -2.1,x-intercept of 3.5   ||Points:  (0,-2.1) and (3.5,0)

  y = mx + (-2.1)

  y = mx - 2.1

finding the slope m

(0,-2.1) and 

(3.5,0) m = -2.1/-3.5 = .6

  y = .6x - 2.1



2)through(1.2,5.1),

x-intercept of 3.7  Pt(3.7,0)

(3.7,0)

(1.2,5.1)  m = -5.1/2.5 = - 2.04

 y = -2.04x + b   || Using Pt(3.7,0) to solve for b

 0 = 

7.548 = b

  y = -2.04x + 7.548 

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