Thursday

July 24, 2014

July 24, 2014

Posted by **cody** on Wednesday, September 21, 2011 at 6:52pm.

solve for (x,y):

3/x + 2/y = 0

5/x - 1/y = 13

i can't graph it, and i can't use a calculator. i keep getting stuck on the second equation b/c i get 5y -13xy -x=0 and since 13 is a prime number i cant figure out what to do next.

- algebra -
**Reiny**, Wednesday, September 21, 2011 at 7:29pmfirst:

3/x + 2/y = 0

times xy

3y + 2x = 0

y = -2x/3

in 2nd:

times xy

5y - x = 13xy

sub in y = -2x/3

5(-2x/3) - x = 13x(-2x/3)

-10x/3 - x = -26x^2/3

times 3

-10x - 3x = -26x^

26x^2 - 13x = 0

13x(2x - 1) = 0

x = 0 or x = 1/2

but x cannot be zero or else we divided by zero in each equation, that would be undefined

x = 1/2

then y = (-2/3)(1/2) = -1/3

**Related Questions**

MATH PLZ HELP - well i'm stumped. i can't figure out how to solve this. solve ...

Algebra 2 - Solve each system 3x+2y= -2 9x- y= -6 I know how to solve for x but ...

Algebra - Hi, how would I solve these 2 equations using algebra? It states in ...

MATH PLEASE HELP! - Solve each system 3x+2y= -2 9x- y= -6 I know how to solve ...

algebra 2 - i cant figure out how to solve this? T with two over powe +7T-18+0 ...

Algebra - Hello again, I am now working on trying to find the relation of x = 1...

College Algebra - solve systems of equations by graphing... I get how to graph ...

algebra - I just need a quick check before I hand in my work if you would......

algebra - (1.) Solve. Then graph กม+8>2 The solution set {กม|กม>blank} (2...

Algebra - Solve for x in terms of a and b (b-a)x=3x-(5/a) I can't figure out ...