Posted by **Jamie** on Friday, February 1, 2013 at 6:22pm.

x-2y=.9

4x-3y=13.1

Solve using the substitution method.

- Algebra -
**Alo**, Friday, February 1, 2013 at 6:44pm
Well first you change x - 2y = .9 to x = .9 + 2y, by adding y from both sides of the equation.

Then, you substitute x=.9 + 27 into 4x - 3y = 13.1 to get 4(.9 + 2y)- 3y= 13.1. Use the distrubutive property and you get 4 * .9 = 3.6 and 4 * 2y = 8y.

Now you have 3.6 + 8y - 3y = 13.1. Simplify to get 3.6 + 5y = 13.1, since 8y - 3y = 5y.

So you subtract 3.6 from both sides to get 5y = 9.5. Divide this by -9 on both sides to get y = 1.9

Plug this in to one of the equations: x - 2y = .9 to get x - 2(1.9) = .9.

You get x - 3.8 = .9. Add 3.8 to both sides to get x=4.7.

The answer is (4.7 , 1.9)

## Answer this Question

## Related Questions

- Algebra 1 - bobpursey, In this problem you helped me with earlier: Solve using ...
- Substitution Method-Plz help - Use the Substitution method to solve the system ...
- Algebra - solve using substitution method: 4x+5y=21 x=48-6y
- Algebra - If 2x + 2y = 20 & 5x - 3y = 15 Solve using the substitution method.
- Algebra Help!! - solve using the substitution method. y= 5 - 3x 4x + y= 7
- Algebra - Solve using substitution method 3x+8y=20 x=24-7y
- Algebra - 4x+y=42 6x-5y=50 Solve using the substitution method.
- Algebra - Solve using the substitution method. 0.3x+0.2y=5,0.5x+0.4y=11
- algebra - Solve using the substitution method 6x-3y=18, 6x+3y=-12
- algebra - using the substitution method how do you solve y=-1/3x y+2x=5

More Related Questions