Question

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

2x + y = 1
4x + 2y = −1

Answer 1

Set the first equation = to. y = -2x+ 1

Now substitute it for y into equation 2 and solve for x.

Answer 2

Get the first equation equal to y so y=1-2x. Then substitute that into the second equation making y=1-2x.
That should give you 4x + 2(1-2x) = -1

Answer 3

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

Answer 4

@ivandelgado, no it cannot.

Answer 5

There is no x value as there is no solution.

Answer 6

There is a solution.
Did you even read what we told you?

Answer 7

If there are 2 equations, where x and y are the same in each, there has to be a solution.

Answer 8

If you can find me two solutions for x, I will pay you $1000.

Answer 9

x=2

Answer 10

@alrightatmaths, what are you talking about??? X has 1 solution. Y has one solution in the porblem here

Answer 11

@Zelda @alrightatmaths

Answer 12

I know, that's what I just said.

Answer 13

I said there has to be a solution. And I was saying that he couldn't find 2 values for x.

Answer 14

so its 2

Answer 15

There are no solutions to that.

Answer 16

@ivandelgado Oh, wow, I'm sorry, your first guess was right. There are no solutions as the lines are parallel.

Answer 17

Yeah, just realized the same thing :P