Question

solve the system of equations by substitution. what is the solution for x
2x + y = 1
4x + 2y = -1
A. x = 0
B. x = 2
C. there is no x value as there is no solution
D. x can be any value as there are an infinite number of solutions

Answer 1

you can try to solve by elimination and see what happens
multiply the first equation by -2 and then add the equations together afterwards

Answer 2

what did you when you multiply the first equation by -2?

Answer 3

y is equal to -2

Answer 4

I think you should try again,

Answer 5

multiply the first equation by -2
so -2(2x+y=1)
is -4x-2y=-2
now add the following equations:
-4x-2y=-2
4x+2y=-1
=============

Answer 6

add the first column -4x+4x
add the second column -2y+2y
=
add the third column -2+(-1)

Answer 7

x + y = -3

Answer 8

something+(-same something)=0

Answer 9

so no solution

Answer 10

-x+x=0
x+(-x)=0

yes
because we have
first column=0
second column=0
=
third column =-3
0+0=-3 <--not a true equation

Answer 11

oh ok i get it thank you so much

Answer 12

np