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October 1, 2014

October 1, 2014

Posted by **Kelley** on Sunday, December 20, 2009 at 7:20pm.

7x-3y=19

I am told that my answer is

wrong, can you help me

(1.24, -3.44)

- math -
**Reiny**, Sunday, December 20, 2009 at 7:27pmWhoever told you that you were wrong, copy this and show them

if x=1.24, y=-3.44

equation#1

LS = 5(1.24) + 5(-3.44)

= 6.2 - 17.2

= -11

= RS

equation #2

LS = 7(1.24) - 3(-3.44)

= 8.68 + 10.32

= 19

= RS

Trust yourself !!

- math -
**drwls**, Sunday, December 20, 2009 at 7:32pmMultiply both sides of the the last equation by 5/3, to give

11.667 x - 5y = 31.667

Add that to the first equation and you get

16.667x = 20.667

x = 1.24

y = (7x-19)/3 = -3.44

If that was your answer, rounded off to three significant figures, then you are correct.

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