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What is the slope and y intercept of 15,3 and 21,6?

+2 votes

please help!

asked Jan 23, 2013 in ALGEBRA 1 by anonymous Apprentice

1 Answer

+2 votes
 
Best answer

slope-intercept form equation is y = mx + b where m is slope and b is y-intercept.

Find the slope m =(y₂ - y₁) / (x₂-x₁ ).

Substitute the coordinate values in slope formula.

m = (6 - 3) / (21 - 15) = 3 /6 = 1/2

The line equation is y = 1/2 x + b

Find the y-intercept value by substituting the any one coordinate point values (15, 3) in above equation.

3 = 1/2 * 15 + b

3 - 15/2 = b

 b = -9/2

The line equation is y = 1/2 x - 9/2

i hope it helps a lil...

answered Jan 23, 2013 by steve Scholar
selected Feb 4, 2013 by casacop

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