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December 22, 2014

December 22, 2014

Posted by **alex** on Monday, March 7, 2011 at 8:17pm.

3x-2y= 8

sovle using substituion

- math -
**jai**, Monday, March 7, 2011 at 8:41pm(1) x + 5y = -3

(2) 3x - 2y = 8

substitution method: we first choose one of the equation, and express one of the variables in terms of the other variable,, here let's choose equation (1), and express x in terms of y:

x + 5y = -3

x = -3 - 5y

now, we substitute this to equation (2), and we solve for y:

3x - 2y = 8

3(-3 - 5y) - 2y = 8

-9 - 15y -2y = 8

-17y = 17

y = -1

substituting this back to either equations to get x (let's choose (1)):

x = -3 - 5y

x = -3 -5(-1)

x = -3 + 5

x = 2

hope this helps~ :)

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