Solve the system of equations by substitution. What is the solution for x?

2x + y = 1
4x + 2y = -1

x = 0

x = 2

There is no x value as there is no solution.

x can be any value, as there is an infinite number of solutions

Question

Solve the system of equations by substitution. What is the solution for x?

2x + y = 1
4x + 2y = -1 

 x = 0 

 x = 2 

 There is no x value as there is no solution. 

 x can be any value, as there is an infinite number of solutions

jdoe0001 · Answer

so..... if you solve say " 2x + y = 1 "   for "y"   what would that look like?

anonymous · Answer

uhm... I been studying this for 3 days now and I don't get it

jdoe0001 · Answer

well.. what if you say    
subtract 2x from both sides  ?

phi · Answer

they want you to solve for x using substitution

2x + y = 1
4x + 2y = -1 

if you use the first equation:  2x +y= 1
add -2x to both sides:  2x - 2x  + y = 1 -2x
simplify the left side:   y= 1-2x

that means y can be replace by (1-2x)
so do that in the second equation

4x + 2(1-2x) = -1

now "solve".  you will find you get a strange result... meaning there is no solution.