Question
How to solve this
-95A+20B=40
-20A-95B=100?

Hi, you want to make one of the variables disappear, that means you need to find a multiple of either A or B so that one is negative and one is positive.

Try 4 times the 1st equation and -19 times the 2nd equation and your A's should cancel out.

Better yet, divide five out of everybody and get the following:

-19A+4B=8. (1)
-4A-19B=20.(2)

Multiply (1) by 4 and (2) by -19.

Let me know if you need more help.
Questioner's Rating
 Rating(1-10) Knowledgeability = 10 Clarity of Response = 10 Politeness = 10 Comment No Comment

Volunteer

##### Expertise

I can answer most questions up through Calculus and some in Number Theory and Abstract Algebra.

##### Experience

I have had my Bachelor's Degree since 1987 and have been a teacher since 1988. I earned my Masters Degree in Mathematics May 2010. I have been teaching at the same community college since 2002.

Education/Credentials
I have taught 12 years at the community college level, medical college, and technical college as well as a high school instructor and alternative education instructor and charter school instructor.

Awards and Honors
Master's GPA 3.56 Bachelor's GPA 3.34 Post grad work not degree related GPA 4.0