Aline goes through the points (-6, -8) and (12, 7). a) what is the slope of the line? show your work. b) write the equation of the line in point-slope form. show your work c) write the equation of the line in slope-intercept form. show your work. a) b) c)

m = , y - 7 = ( x - 12), y = x - 3

(a) calculate the slope using the gradient formula

m = (y₂ - y₁ ) / (x₂ - x₁ )

with (x₁, y₁ ) = (- 6, - 8) and (x₂, y₂) = (12, 7)

m = = =

(b) the equation of a line in point-slope form is

y - b = m(x - a )

where m is the slope and (a, b) a point on the line

using m = and (a , b) = (12, 7 )

y - 7 = (x - 12)

(c) the equation of a line in slope-intercept form is

y = mx + c ( m is the slope and c the y-intercept )

rearrange (b ) into this form

y - 7 = - 10

y = x - 3

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