Posted by at a lost on Friday, March 8, 2013 at 9:23pm.
use substitution to solve system
2x+y= 9
=5x+4y= 30

math  Steve, Friday, March 8, 2013 at 11:56pm
hmmm. you must really be confused; not only at a loss, but at a lost!
we see that
2x+y = 9, so
y = 2x9
now substitute that into the other equation:
5x+4(2x9) = 30
13x = 6
x = 6/13
so, y=2x9 = 105/13
The =5x+4y confuses me. If that was supposed to be 5x, then
5x+4(2x9) = 30
3x = 6
x=2
which seems like a better answer.
Answer This Question
Related Questions
 algebra  i need help with these problems (either a solution or how to plug them...
 Math Homework  Hello! I need help with these math questions, thanks! :) 1.) ...
 Substitution MethodPlz help  Use the Substitution method to solve the system ...
 Math  17) solve this linear system using the method of substitution. 2yx=10 y...
 math  solve each system of equations by substitution. y=3x9 please help ...
 maths  use the substitution method to solve the linear system. 1. 3x=9 x+2y=9 ...
 Math  Use substitution to solve the system. 3x+5y=21 y=2x1
 math  use substitution to solve the system 5x+2y=27 y=2x+11 x= y=
 math  use the substitution to solve the system 5x+24=27 y=2x+11 x= y=
 Algebra 1 Math  use substitution to solve the system 2xy=4 3x+y=9
More Related Questions