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About Chanda Walker
Expertise
I can answer word problems involving mathematics at the high school and college level. I particularly enjoy calculus word problems. Please don't just type the math problem without comments. If you don't tell me what problem your having, I can't help.

Experience
Have done word problems as a tutor and as a student of mathematics and physics for years.

Organizations
Sigma Xi

Education/Credentials
Optical Science PhD

Past/Present Clients
I've answered hundreds of questions here at AllExperts.com in algebra, physics and general math sections.

 
   

You are here:  Experts > Science > Math for Kids > Word Problems > two equations with two variables

Word Problems - two equations with two variables


Expert: Chanda Walker - 3/17/2009

Question
the sum of two numbers is 18 less than twice the first number.  their difference is 32 less than twice the second number.  find each of the numbers

Answer
x + y = 2x - 18
x - y = y - 32

y = x - 18
x = 2y - 32

x = 2*(x - 18) - 32
x = 2x - 36 - 32
68 = x

y = 50

Check!

68 + 50 ?=? 2* 68 - 18
118 ?=? 136 - 18
118 = 118

68 - 50 ?=? 50 - 32
18 = 18

That's the solution!

Let me know if I can help further.


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