Question

solve by the eliminatin method
7r-9s=-1
9r+7s=73
the solution is

Answer 1

multiply first equation by -9 & second - by 7; add together...
let me know if there is a problem

Answer 2

could you show me i do not know how to work this

Answer 3

multiply first equation by -9 & second - by 7:
-63r+81s=9
63r+49s=511

add together... should "eliminate" s, right...?

Answer 4

will eliminate r (not s!)

Answer 5

what did you got for s?

Answer 6

after adding 2 equations together you should be left with:
130s=520
s=520/130
s=....?

Answer 7

Is th answer 4

Answer 8

good!
now find r, please
to do that, put value of s in ANY original equations above.
Try it, please

Answer 9

confused now so that was not the end of the equation

Answer 10

in original equations you have 2 variables.
we found s, now - need to find r

Answer 11

because s=4, then by using original:
7r-9s=-1
we will have:
7r-9*4=-1
7r-36=-1
can you solve it for r?

Answer 12

29

Answer 13

7r=36-1
7r=35
r=35/7
r=5

Answer 14

so, you got answer:
r=5 and s=4

Good Luck!

Answer 15

so the solution is an ordered pair of (5,4) correct

Answer 16

right

Answer 17

thanks you inik you broke it down very simple for me to understand I have not had math in over 35years thank you for your support

Answer 18

you are very welcome!!
let me know if there are any questions - happy to help :)

Answer 19

okay