Lauren H. answered • 03/28/19

Experienced High School Chemistry Teacher

100c + 300b = 450

200c + 200b = 400

__-2(100c + 300b = 450)__

-400b = -500

b = 1.25 or

c = .75 (by substitution)

Chay B.

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Lauren H. answered • 03/28/19

Tutor

4.8
(24)
Experienced High School Chemistry Teacher

100c + 300b = 450

200c + 200b = 400

__-2(100c + 300b = 450)__

-400b = -500

b = 1.25 or

c = .75 (by substitution)

Christina L. answered • 03/28/19

Tutor

New to Wyzant
Experienced Math and Test Prep Tutor

100x + 300y = 450

200x + 200y = 400

You can you elimination here but multiplying the top equation by -2

-200x + -600y = -900

200x + 200y = 400

Subtract down

-400y = -500

divide by -400

**y = 1.25**

------------------------------------------------------------------------------------------------------------

Plug Y back into the original equation to find x

100x + 300(1.25) = 450

100x + 375 = 450

subtract 375 from both sides

100x = 75

divide by 100

**x = .75**

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