Homework Help: Algebra

Posted by A.W. on Friday, March 6, 2009 at 4:53pm.

How do I solve for elimination method on this problem: 0.3x - 0.2y=4 and 0.3x + 0.3y= 5/19. I know that multiply by 10 on both equations and get 3x-2y=40 and 3x+3y=50/19. and then I have to multiply 3x-3y=40 by 3 and 3x+3y= 50/19 by -3 to get 9x-9y=120 and -9x-9y=-150/19. But from there I get lost. Can someone please help me?

Algebra - Damon, Friday, March 6, 2009 at 4:54pm
I just did your earlier problem. Please study that. If you can do one you can do them all.
Algebra - Damon, Friday, March 6, 2009 at 5:00pm
first if you have .3 x in both, why multiply by 10?

.3 x - .2 y = 4
.3 x + .3 y = 5/19
subtract second from first
0 x - .5 y = 71/19

y = - 142/19

so
.3 x - .2 (-142/19) = 40
3 x = -2(142/19) + 760/19
3 x = 476/19
x = 476/57

Answer this Question

Related Questions

algebra - needing help with is problem solve for x: 3x-2y=-6 here is my solution...
math - How do I solve the equations using the elimination method: .3x-.2y=4 and...
Math - Please I need to solve this problem Use the elimination method 0.3x -0.2y...
Algebra - Solving system of linear equations by using the apropiate method name ...
math(algebra 1) - i dont get these please help me: use the subtitution method to...
algebra - Solve using the elimination method. Show your work. If the system has ...
Pre-Calculus - Solve for x,y,z, & w using the Gauss-Jordan Elimination ...
algebra - Solve by the elimination method: 0.3x-0.2y=4 0.4x+0.5y= -29/19 (...
MaTh = Algebra = help - Solve this system of linear equaiton by an algebraic ...
Algebra - can you solve this set of equations using the elimination method? 3x+...

For Further Reading

First Name:
School Subject:
Answer: