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January 30, 2015

January 30, 2015

Posted by **rr** on Monday, May 21, 2012 at 9:33pm.

- algebra -
**Jai**, Monday, May 21, 2012 at 10:16pmfor this problem, we will substitute the given to the equation p = mx + b, and then we solve simultaneously (two equations, two unknowns):

25 = 56m + b

20 = 66m + b

to solve this, we can multiply one equation by -1 so that if we add the equations, the b will be cancelled:

-25 = -56m - b

20 = 66m + b

-----------------------

-5 = 10m

m = -1/2

to get be, we substitute this m to either equations. In this case, let's just substitute to the first equation:

25 = 56m + b

25 = 56(-1/2) + b

25 = -28 + b

b = 53

therefore, the equation is

p = (-1/2)x + 53

hope this helps~ :)

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