Posted by **Mayank** on Monday, July 16, 2012 at 2:32am.

Solve:

3x + 7y + 5= 0

4x - 3y - 8 = 0

Find p; if:

px + y - 1= 0

- Math -
**Jai**, Monday, July 16, 2012 at 5:00am
I.

3x + 7y + 5 = 0

4x - 3y - 8 = 0

To solve, we can either use substitution or elimination method. For substitution, we choose one equation and represent one variable in terms of the other. Let's choose the first equation, and represent x in terms of y:

3x + 7y + 5 = 0

3x = -7y - 5

x = (-7/3)y - 5/3

then we substitute this to the 2nd equation:

4x - 3y - 8 = 0

4[(-7/3)y - 5/3] - 3y - 8 = 0

(-28/3 y - 20/3 - 3y - 8 = 0)*3

-28y - 20 - 9y - 24 = 0

-37y = 44

y = -44/37

substituting this back to either equations and solving for x,

x = 41/37

II.

px + y - 1= 0

px = 1 - y

p = (1-y)/x

hope this helps~ :)

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