Question

solve by the elimination method, type an ordered pair
7r-8s=55
8r+7s=79

Answer 1

You need to get either the r's or the s's to be eliminated. Because the s's have a "+" and a "-" already, I would choose the s's.

Answer 2

The first common number 7 and 8 have in common is 56 so we are going to multiply the first equation by 7 so I can get -56s

Answer 3

Going to multiply the second equation by 8 so we can get a +56s

Answer 4

7(7r - 8s = 55)
8(8r + 7s = 79)

Answer 5

49r - 56s = 385
64r + 56s = 632

Answer 6

i solve that quastion yesterday Charlie... http://openstudy.com/?F240238930417BYII5Z=_#/updates/4eab39f4e4b02eee39e6ea69

Answer 7

Now add these up
113r = 1017
r = 9

Answer 8

Yes, Leo you were very helpful yesterday and I appreciate it. Only I discovered I also need a set of ordered pairs out of the equation. Thanks dude.

Answer 9

Substitue 9 in for r
7(9) -8s = 55
63 - 8s = 55
-8s = -8
s = 1

Ordered pair (9,1)

Answer 10

thank you very much blexting.

Answer 11

was just put the answer in the form (r, s)

Answer 12

:)