# algebra

posted by .

5x - 9y = 7,
7y - 3x = -5

solve using any algebraic method

• algebra -

7y-3(9y+7)/5 = -5
y = -1/2
so, x = 1/2

• algebra -

Steve can you explain how you got the answer to this??

• algebra -

sure. the first equation

5x - 9y = 7

tells us that x = (9y+7)/5

Just plug that into the 2nd equation, and you get

7y-3(9y+7)/5 = -5
fractions are a nuisance, so multiply through by 5:
35y - 3(9y+7) = -25
35y - 27y - 21 = -25
8y = -4
y = -1/2

Now plug that value into either equation and solve for x.

## Similar Questions

1. ### maths-algebra

solve these similtanious equations using an algebraic method 4x+3y=21 2x+y=8 you must show your working multiply the second equation by two.. 4x + 2y=16 Now subtract that equation from the first.
2. ### Math(Solve the system)

So I guess I have to: Solve the system using any algebraic method. I'm not sure how so here is the problem I'm stuck on. 9x-5y=-30 x+2y=-3
3. ### Algebra 2

Solve the system using any algebraic method. 22.)2x-5y=4 23.)5x+7y=12 24.)3x-4y=6 3x+4y=9 3x-2y=8 4x+7y=1 Thanks!
4. ### MaTh = Algebra = help

Solve this system of linear equaiton by an algebraic method. So If I had to solve this the elimination method way, how would I do it?
5. ### ALGEBRA

SOLVE BY ALGEBRAIC METHOD Y=3X 1/3X + 1/2y =11
6. ### algebra 1

Solve the following systems of linear equations using any algebraic method.If possible,check your solution. 1)2x+5y=3 X-3y=7 2) 3y=11-2x 3x=y-11 3)8x-6y=14 12x-9y=18
7. ### algebra 1

Solve the following system of linear equation using any algebraic method. 2x+5y=3 X-3y=7
8. ### algebra 1

Solve the following system of linear equation using any algebraic method. 2x+5y=3 X-3y=7
9. ### algebra 1

Solve the following system of linear equation using any algebraic method. 2x+5y=3 X-3y=7
10. ### algebra 1

Solve the following systems of linear equations using algebraic method. 1)3y=11-2x 3x=y-11 2)8x-6y=14 12x-9y=18

More Similar Questions