Question

I have to solve the following system of equations using elimination, substitution, and graphing.

4x+y=13
6x-y=7

I solved using each way, but I got different answers. Is that supposed to happen? Please help!

Answer 1

lol. Can you show how you done it? There is no way you can get different answers

Answer 2

You should not be getting different answers. Do you have to solve it EACH way or can you pick one?

Answer 3

I have to solve it each way. For elimination, I got (2,5), substitution I got (10, -27), and graphing I got No Solution.

Answer 4

The elimination way gets the correct answer btw. Just recheck the substitution or post it here

Answer 5

For substitution, I did this.

Answer 6

I see the mistake. Its +4x not -4

Answer 7

For graphing, I did this. (The one in the left-hand corner.)

Answer 8

On your 3rd line of working out

Answer 9

But the 4x is positive in the original equation.

Answer 10

could you please explain it?

Answer 11

You see in red? THe brackets I drew? That is what you forgot to do.

Answer 12

yes. could you please wait while i solve so that you can check it?

Answer 13

ok..

Answer 14

x=-3

Answer 15

wait, no x=10

Answer 16

and y=-27

Answer 17

Hmm nope?

Answer 18

is x =-3?

Answer 19

x should be 2

Answer 20

could you help me understand how to get that?