Question

Solve using linear combination.
x – y = –7
x + y = 7

(–7, 0)
(7, 0)
(0, 7)
(0, –7)

Answer 1

elimination basically opposites cancel so what 2 variables can we get rid of right away?

Answer 2

Any ideas?

Answer 3

subtract 'y'?

Answer 4

yep so we have 2x=0
and you get x=0

Answer 5

(0) – y = –7

Answer 6

0-y= -7

Answer 7

Solve.

Answer 8

So it would be 'D'? i think.

Answer 9

no quite remeber a negative divded by a negative is positive to
-7/-y=?

Answer 10

Oh! so positive 7 then.

Answer 11

yes :)

Answer 12

Would the 0 still be before the 7? (0,7) or (7,0)

Answer 13

yes

Answer 14

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Answer 15

Thank you :)

Answer 16

:)