math

posted by .

100- 4 Px + Py +40 = 0
100- 4 Py + Px +40 = 0
Solve the above two equations to get Py = Px = 140/3.

How would you solve the two eq above??

• math -

Note that the two equations are not identical.

Rearrange the equations:
100- 4 Px + Py +40 = 0...(1)
100- 4 Py + Px +40 = 0...(2)

4Px-Py=140...(1a)
Px-4Py=-140...(1b)

Solve equations by elimination to get Px=Py=140/3

4*(1a)-(1b):
15Px=700, or Px=140/3

Similarly:
(1a)-4(1b):
-3Py=-420, or Py=140/3

Similar Questions

1. Math

I just don't understand this question: h(t)=A*b^x h(3)=4 h(5)=40 Solve for b Would you plug 3 into the x and set it equal to 4?
2. Algebra111111!!!

Choose the ordered pair that is a solution to the system of equations. -x + y = 12 x + 2y = 3 a. (7, 5) b. (5, -7) c. (-7, 5) d. (-7, -5) e. none of the above This question wants you to find the point of intersection of the two lines, …
3. algebra 1

I'm stuck on this problem. Can you help? -4x-9y=1 -x + 2y =-4 WHat is x and y?
4. algebra

how would i find an equation of a line that goes through points(1,6) and (3,10)?
5. Math

How do I write the Symmetric Equation of a line given the following parametric equations: (where t is a scalar) x=0t y=0t z=1+1t I know normally I would solve each equation for t and set the equations equal to one another. However, …
6. Math

Please help! x-2y+z=7 2x+y-z=0 3x+2y-2z=-2 a. Solve the above system of equations using Gaussian Elimination or Gauss-Jordan Elimination. You must show row operations. b. Solve the above system of equations using Cramer's Rule.
7. Mathematics

3x - 21 = 2y 3y = 84 - 6x Using the two equations above, solve for y. A.11 B.35 C.-6 D.6