Question

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

Solve the system of equations using substitution.












A)
(-2,-4)



B)
(-2,0)



C)
(-6,-4)



D)
(-6,8)

Answer 1

please help me:):)

Answer 2

lets label the two equation like this 1) y=x+2
2) 2x-y=-4

Answer 3

realize that the values of y is x+2 so we can replace y by x+2 in the second equation yes?

Answer 4

can you interact with me! because i don't like talking to myself

Answer 5

if you understand something say yes if not say no nope or what ever

Answer 6

so i know where do you stuck and see how to explain

Answer 7

so... do we agree that we need to replace y by x+2 in the second equation?

Answer 8

???

Answer 9

tell you are ready tag me^_-

Answer 10

I think c is the answer:)

Answer 11

it is not about guessing the answer! you need to know why it is the answer

Answer 12

show how did you find it

Answer 13

I know you can do this! have trust on you abilities and you will see that you can solve this

Answer 14

come on just trust me! you can do it

Answer 15

do we have y=x+2 ?
don't worry about those variables that much
it just something that tells us if the right side 3 so the left hand side is also 3 it is equation because it balances the sides like scale for example
y is some number
and when we say y=x+2
that mean x+2 has to be the same number
our goal is to find y and x that give us this equations

Answer 16

let me start over 1) y=x+2
2) 2x-y=-4
i would substitute y in the second 2) equation to get this:
2x-(x+2)=-4 (since y=x+2 this is legitimate)
now i need to open the brackets
2x-x-2=-4 (x become -x and +2 becomes -2 because I'm distributing -1 if you look at this -(x+2) you see that -1 is attached to (x+2) so i need to distribute it over just like we do when we have a(b+c)=ab+ac)
Now we have 2x-x-2=-4
2x-x=1x=x (if you have two things and you take out of them you are left with only one)
then the equation becomes:
x-2=-4
now i need to add 2 to both side
x-2 =-4
+2 = +2
----------------------
x=-4+2
now we are done just subtract 4 from 2
which mean owing since 2 is less than 4
we get x=-2
we go back to you 1) equation y=x+2
since we found x=-2
then y=-2+2
you owe me 2 dollar and i owe you 2 dollars so we are even
so y=-2+2=0
y=0
summary we found x=-2 and y=0

Answer 17

so which answer do you think is right?

Answer 18

remember (x,y) is in this order
x=-2 and y=0

Answer 19

A

Answer 20

hmm A says
x=-2 and y=-4

Answer 21

@1497

Answer 22

yea I say A

Answer 23

I'm saying A in not correct
since it says x=-2 and y=-4
but we found that x=-2 and y=0