A few days ago
Anonymous

Substitution for x any y do sum please?

Substitution for x any y

4x + y = -7

2x – y = -1

not sure if my answer is right

x = -1 1/3

y= 9

Top 2 Answers
A few days ago
Anonymous

Favorite Answer

You’re close!

These two equations are already in a great form. Just add them together …

(4x+y) + (2x-y) = (-7) + (-1)

Rearrange …

(4x+2X) + (y – y) = -8

Finally…

6x=-8

Thus

x = -4/3 (Which of course is what you got)

Now just substitute back into one of the original equations …

2(-4/3) -y = -1

Solve for y…

y = -8/3+1 = -5/3

[You can verify these answers by plugging them both into the other original equation]

0

A few days ago
٭ßα©© н∂ⁿ@ℓ٭зNe♥
4x + y = -7

-4x -4x

y = -4x – 7

2x – (-4x – 7) = -1

2x + 4x + 7 = -1

6x + 7 = -1

-7 -7

6x/6 = -8/6

x = -1 1/3

4x + y = – 7

4 (-1 1/3) + y = -7

-5 1/3 + y = -7

+5 1/3 +5 1/3

y = -1 2/3

Ur first answer was right though!!! hope this helped.

Althought i don’t know what the hell “mike” is doing!

0