Question

Solve this system of equations using any method.

3x – y = 4
x + 2y = 13
A.(5, 11)

B.(–1, 7)


C.(3, 5)

D.(4, 8)

Answer 1

Hi there! Welcome to openstduy :)
So we have 2 equations
3x – y = 4 <---equation 1
x + 2y = 13 <----equation 2
I know the substitution method well enough to teach it to you so lets stick with that :))
Lets start by isolating a variable equation 2 has a variable alone lets isolate it
x + 2y = 13 <----equation 2
Subtract 2y from both sides
x=-2y+13
Now we have
3x – y = 4 <---equation 1
x=-2y+13 <---equation 2
Now we know the value of x let's plug equation #2 into equation #1
\[\huge~\rm~\bf 3-2y+13 – y = 4 \]Solve for y tell me what you get :)

Answer 2

@jojoheart if you are confused on any part please let me know!

Answer 3

So is it D?

Answer 4

Nope

Answer 5

B..?

Answer 6

Nope how bout you try to do the work? :)

Answer 7

Thanks I got it! It's A!

Answer 8

Its not A -.-