Posted by **Chica** on Sunday, January 24, 2010 at 9:15pm.

Solve each linear system by substitution method.

x+2y=7

2x+4y=8

I'm getting stuck. Could some one explain the work out process and what the outcome means?

- algebra 1 -
**Reiny**, Sunday, January 24, 2010 at 10:02pm
change the first to x = 7 - 2y

sub that into the second

2x + 4y = 8

2(7-2y) + 4y = 8

14 - 4y + 4y = 8

14 = 8 ???? Wow

When this happens there is no solution

Looking at your equations more closely, ..

divide the second by 2 to get

x + 2y = 8 and the first said

x + 2y = 7 ... contradiction !

What you are looking at is really two straight lines that are parallel, they cannot intersect.

## Answer this Question

## Related Questions

- algebra - Requesting help. (I must reckon, that X is a variable, and y is y-...
- Algebra - Solve this system of linear equations. * Used the substitution method ...
- Substitution Method-Plz help - Use the Substitution method to solve the system ...
- Linear Equations - Can you please help solve this equation using the ...
- Algebra 1 - Okay. So I am completely lost with this... Any help would be great! ...
- Algebra - Use the substitution method to solve the linear system. 1/8p+3/4q=7 3/...
- algebra - Use the substitution method to solve the linear system. Thanks! s= t+4...
- Algebra - -3x + 2y = 8 x + 4y = -4 use substitution method to solve the linear ...
- algebra - how do you use the substitution method to solve the linear system? -2x...
- maths - use the substitution method to solve the linear system. 1. 3x=9 -x+2y=9 ...