SOLUTION: How do you solve by substitution or elimination these linear equations? {2x+y=5} {1x+2y=4} I get confused on these steps.

Algebra ->  Coordinate Systems and Linear Equations -> SOLUTION: How do you solve by substitution or elimination these linear equations? {2x+y=5} {1x+2y=4} I get confused on these steps.      Log On


   

Question 560949: How do you solve by substitution or elimination these linear equations?
{2x+y=5}
{1x+2y=4}
I get confused on these steps.
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
2x+1y=5 .............1
1x+2y = 4 .............2
Eliminate y
multiply (1)by -2
Multiply (2) by 1
-4x-2y= -10
1x+2y= 4
Add the two equations
-3x=-6
/-3
x=2
plug value of x in (1)
2x+1y=5
4+1y=5
1 y = 5 -4
y = 1