Question 914953
Rule: 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. 
{{{y = highlight_green(2)x + highlight(5)}}}, m = 2
.......
New Line Using point-slope form, {{{y - y[1] = m(x - x[1])}}}P(2,1)
y - 1 = 2(x-2)
y - 1 = 2x - 4
y = 2x - 3