You are here:
Algebra/Help!
Advertisement
Question
I need help solving this substitution method problem.
x + y = -4
x - y = 2
Can you help me please?
Note that both equations can be solved for x.
The 1st one gives x = -y - 4.
The 2nd one gives x = y + 2.
Since both are values for x, set them equal and solve for y.
Using this value of y, put it back in equation 1 to find x.
Using the 2nd equation, put in both x and y to make sure the answer is right.
Related Articles
Algebra
Answers by Expert:
Scott A Wilson
Expertise
Any algebraic question you've got, like linear, quadratic, exponential, etc.
Experience
solving story problems
solving linear, parabolic, and 3rd order equations
solving equations with multiple variables
Publications
documents at Boeing
Education/Credentials
MS at math OSU in mathematics at OSU
BS at OSU in mathematical sciences (math, statistics, computer science)
Awards and Honors
both BS and MS degrees were given with honors
Past/Present Clients
students from all over since the 80's; over 1,000 in algebra
©2012 About.com, a part of The New York Times Company. All rights reserved.