Solve the following system of equations
-2x+y=1
-4x+y=-1

Question

Solve the following system of equations 
-2x+y=1
-4x+y=-1

anonymous · Answer

@vocaloid

anonymous · Answer

Do we have to solve with substitution or elimination?

dayakar · Answer

subtract second  from first

anonymous · Answer

It doesn't say I have been working with both

anonymous · Answer

So I subtract the -4 from the -2?

anonymous · Answer

No wait.

anonymous · Answer

Let me explain.

dayakar · Answer

can u do

anonymous · Answer

For the first one.. when you solve by dividing -2 from both sides... you should get:

$$y = 2x + 1$$

anonymous · Answer

So now you know what y is... now you have to plug y into the second equation for y...

anonymous · Answer

So you would do $$-4x + (2x + 1) = -1$$

anonymous · Answer

Well... are there any choices? @Kitty.10

anonymous · Answer

they would help.

anonymous · Answer

These are my choices  
A (3,1)
B(-1,3)
C(-1,-3)
D(1,3)

anonymous · Answer

Okay great! So when you solve you should get x = 1!

anonymous · Answer

Then.... plug x in as 1 and solve for y!

anonymous · Answer

So I eliminate A?

anonymous · Answer

Yes! :)

anonymous · Answer

So when you plug in x as 1

You should solve this:

$$-2(1)+y=1$$

anonymous · Answer

And c since it is negative?

anonymous · Answer

When you do solve that you should get y = 3!

anonymous · Answer

No!

anonymous · Answer

x is positive 1...

anonymous · Answer

Yes I eliminate C

anonymous · Answer

So if x is 1 and y is 3.. what is the answer?

anonymous · Answer

So the answer is D?

anonymous · Answer

YES! Great job!

@Kitty.10

anonymous · Answer

Hope this helped! Have a great day!

Also a medal would be much appreciated! Just click best response next to my answer. Thank You!

@Kitty.10

anonymous · Answer

Thanks !

nonopro · Answer

@Kitty.10 here are the real hard to read answers