Question 928887
Line 1
 x y
–3 7
–2 5  m ={{{(y[1] - y[2])/(x[1] - x[2] )}}} = 2/-1 = -2
***Using point-slope form, {{{y - y[1] = highlight_green(m)(x - x[1])}}} P(-2,5)
y - 5 = -2(x + 2)  0r y = -2x + 1
 Line 2
 x y
 0 5
 2 1  m ={{{(y[1] - y[2])/(x[1] - x[2] )}}} = 4/-2 = -2
***Using point-slope form, {{{y - y[1] = highlight_green(m)(x - x[1])}}}P(0,5)
y - 5 = -2(x-0)  0r  y = -2x + 5
.......
the standard slope-intercept form for an equation of a line is 
{{{y = highlight_green(m)x + highlight(b)}}}  where m is the slope and b the y-intercept.