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~ :)

## Answer This Question

## Related Questions

- MATH PLEASEEEEE - I have a question, if f(x)=x/2 and g(x)=3x+1 find: a) (f+g)(x...
- math - 1.solve for p 3(p+q)=p A.q=-2/3p B.q=-3/2p C.p=-2/3q D.p=-3/2q 2. solve ...
- Calculus - Let h(x)= x^3 + 4x -2. Let g(x) represent the inverse of h(x). Find g...
- math - solve each equation for 0=/<x=/<2pi sin^2x + 5sinx + 6 = 0? how do ...
- Math help please - 1. Solve for x. 4(x - b) = x b = 4/3x b = 3/4x x = 4/3b x = 3...
- Math - We have an important chemsitry test due and I want to make sure that I do...
- math - how would I solve 10=7-m? I don't understand how to find the variable and...
- Math - Solve the system by addition or substitution. 3x – 4y = 8 6x – 2y = 10 ...
- English - 1. He can not solve the math problem. 2. He cannot solve the math ...
- math - I'm struggling with this problem and can't find a good example in my book...

More Related Questions