Question

need help
x + 3y = 7
x - 3y = 1
Solve the system of equations.
A) x = 4, y = 1
B) x = 1, y = 4
C) x = -2/3, y = 3
D) x = 3, y = -2/3

Answer 1

WAS

Answer 2

Take a good look at the 2 equations given. I see a very easy way in which youi could solve this system. But first, what would YOU do?

Answer 3

maybe cancellation

Answer 4

Yes. Add the 2 equations together. Please share your result.

Answer 5

after i cancel all i get is x=7 and x=1

Answer 6

I'd like to see your results, please (including all steps you took to combine these equations).

Answer 7

x + 3y = 7
x - 3y = 1

You have to combine all terms, column by column. for example, combining the 2nd column results in 0 for that column. Please combine columns 1 and 3 now.

Answer 8

so 7 +1 =8

Answer 9

and that would be column 3

Answer 10

and column 1would just be x

Answer 11

it would be 2x=8

Answer 12

"and column 1would just be x" Not so.

You end up with 2x=8.
Solve this for x.

Next, subst. your newly-found x-value into either of the given equations to find y.

Write your solution in the form (x, y).

Answer 13

4,1