Question

Choose the correct solution of the given system of equations.

y + 2x = -1
3y - x = 4

Answer 1

Solutions

a. (-1,1)
b. (1,1)
c. no solution
d. none of the above

Answer 2

Is this the one where you can subtract them from each other? Or sub?

Answer 3

ya

Answer 4

Do you know how to solve the system of equations?

Answer 5

ya. sort of

Answer 6

for the most part

Answer 7

Okay, so solve it :-)

Answer 8

:( your no fun. :) lol

Answer 9

I always seem to end up with really long numbers like irrational decimals

Answer 10

I sub x with ) for the first equation and got -1, but i don't know if I'm doing it right lol

Answer 11

how'd u do it?

Answer 12

@whpalmer4 , is it b?

Answer 13

i think it might be b

Answer 14

wait

Answer 15

it could be a

Answer 16

:(

Answer 17

y+2(0)=-1
y+0=-1
(add 0 to both the 0 & the -1)
0 cancels out and you get y=-1

Answer 18

I think it might be A, but don't lean on me lol

Answer 19

You would subtract 0 from both sides
In this 1 it doesnt really matter, but u would subtract

Answer 20

The answer is a

Answer 21

Good night

Answer 22

Yea, I meant subtract...Goodnight

Answer 23

\[y + 2x = -1\]\[3y - x = 4\]

We can easily solve the first equation for \(y\), or the second equation for \(x\). Let's do the former:

\[y + 2x = -1\]\[y = -1-2x\]Now substitute that into the other equation:
\[3(-1-2x)-x = 4\]\[-3-6x-x = 4\]\[-7x=7\]\[x=-1\]Now put that in the substitution equation to find \(y\):\[y = -1-2(-1)\]\[y = -1+2\]\[y = 1\]So our solution is \((-1,1)\)

Checking:

\[1+2(-1) = -1\checkmark\]\[3(1)-(-1) = 4\checkmark\]