Question

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

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

Answer 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.

Answer 2

its like
a
b
c
d

Answer 3

ok let's solve the first equation for y:
2x + y = 1
y = 1 - 2x

Answer 4

Then we substitute this into the other equation:
4x + 2(1-2x) =-1

Answer 5

Can you solve it from here?

Answer 6

4x + 2 - 4x = -1?

Answer 7

4x - 4x = 1?

Answer 8

0 = 1?

Answer 9

Yup, and what does that mean?

Answer 10

there is no answer or in other words c?

Answer 11

Nicely done :)

Answer 12

Can you help with another?

Answer 13

ok

Answer 14

Solve the system of equations.

5x + y = 9
3x + 2y = 4

Answer 15

(-2, 5)

(1, 4)

(2, -1)

(4, -4)

Answer 16

let me try I think I can do it and then you check!

Answer 17

is it c?

Answer 18

Yes it is

Answer 19

thank you :) howd you get it?