Find the line that passes through the points (-2,3) and (1,-12)

Algebra
Tutor: None Selected Time limit: 1 Day

Find the line that passes through the points (-2,3) and (1,-12)

Sep 24th, 2015

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To find the equation of the line passes through the points (-2,3) and (1,-12) ;

first we know the form of an equation of line is :  y = ax + b 

so should we find  a and b 

to find a , must   a = (y2 - y1)/(x2 - x1) = (-12 - 3)/(1 - (-2)) = -15/3 = 5 

so : y = 5x + b to find  b should chose one point (-2,3) per exemple  

and we put the point on the equation : 

3 = 5 * (-2) + b 

so : 

3 = -10 + b 

so : 

b = 13 

finally the equation of the line is : 

y = 5x + 13 


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Sep 24th, 2015

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