Solve this system of equations using substitution, elimination or graphing. Show all of your work for the method you choose.

y = 6x – 4
y = -2x + 28

Question

Solve this system of equations using substitution, elimination or graphing. Show all of your work for the method you choose.

y = 6x – 4
y = -2x + 28

anonymous · Answer

Well, we can see that y and y are very similar. Multiply a -1 to the top equation and then cancel out the y. That is your first step.

anonymous · Answer

ok

anonymous · Answer

You should have
0=-6x+4
0=-2x+28

anonymous · Answer

Now you can add them together to get
0=-8x+32

anonymous · Answer

Bring 32 over to the other side to get -32 = -8x.
Can you solve x from here?

anonymous · Answer

do I divide -8 on both sides @KirbyLegs

anonymous · Answer

Yes you do. then the -8 will cancel out leaving you with 4 = x

anonymous · Answer

ok thats what I got! Thanks :)

nirmalnema · Answer

simply u can use double substitution method..
two different values of y are given.
is you will equate it then you will get the value of x
y = 6x – 4
y = -2x + 28
y=y
6x-4=-2x+28
transfer the like terms to one side
6x+2x=28+4
8x=32
x=4
put the value in any eq you will get y
y=6(4)-4
=20
x=4
y=20

anonymous · Answer

ohh

nirmalnema · Answer

yup....

anonymous · Answer

thats interesting! thanks :)

nirmalnema · Answer

no problem thanks..