Thursday

November 27, 2014

November 27, 2014

Posted by **Mari** on Thursday, January 19, 2012 at 11:16pm.

~Please provide an explanation as well.

Please and thanks!

- Math, help needed -
**PsyDAG**, Friday, January 20, 2012 at 10:31am3C + D = 20

D = 20-3C

2C + 2D = 22

Substitute 20-3C for D in second equation and solve for C. Insert that value into the first equation and solve for D. Check by inserting both values into the second equation.

**Answer this Question**

**Related Questions**

Math. - Kate bought 3 CDs and 1 DVD at a store. Her friend Joel bought 2 CDs and...

Algebra - Word Problems (Addition/Elimination Method). Check if my answers are ...

Algerbra 1 - Shane and Kate are preparing to go on long car trips with their ...

multi step equations - Joel has twice as many cds as Mary has. Subtracting 7 ...

math - Joel has twice as many cds as Mary has. Subtracting 7 from the number of ...

Math - Henry went to two different music stores to buy some new CDs. At Store A ...

math - Joel has twice as many CDs as Mariella has. Subtracting 7 from the ...

Jonh muir - Jen nad 6 blank CDs, but needed to buy more. She bought 2 packs of ...

Math - Write and equation to match the problem situation below. Callie has 4 ...

math - rudy went to the mall to spend some of his money he earned. he spent 1/3 ...