Homework Help: subsitution method

Posted by mike on Sunday, July 1, 2007 at 9:13am.

Can some one show me how to use the Substitution method to solve the system of these equations.

x + y = -4
x - y = 2

x + y = 10
y = x + 8

on the first set.
Solve for either x or y in either equation, then put that value into the other equation.

Example:
x + y = -4
x - y = 2

solve for x in the first:
x= -y-4
Put it in the second then..
-y-4 -y=2
-2y=6
y=-3
then solve for x..
x=-y-4=-1

No one has answered this question yet.

Answer this Question

Related Questions

Linear Equations - Can you please help solve this equation using the ...
Substitution Method-Plz help - Use the Substitution method to solve the system ...
Substitution Method - Use the Substitution method to solve the system of ...
calculus - When using the substitution method to solve a nonlinear system of ...
Algebra - Systems of equations can be solved by graphing or by using ...
Algebra II - How do you solve the linear equations x+y=5 3x-y=3 by use of the ...
Algebra 1 HELP PLZ!!! - Use the Substitution method to solve the system of ...
algebra - when you solve a system of equations by the substitution method, how ...
algebra - Can someone help me figure this out please? when you solve a system of...
Algebra - When is the substitution method a better method than graphing for ...

For Further Reading

First Name:
School Subject:
Answer: