SOLUTION: Systems of equations can be solved by graphing or by using substitution or elimination. y = x + 5 and x + y = -2 which method would you use?

Algebra ->  Expressions-with-variables -> SOLUTION: Systems of equations can be solved by graphing or by using substitution or elimination. y = x + 5 and x + y = -2 which method would you use?      Log On


   

Question 480044: Systems of equations can be solved by graphing or by using substitution or elimination.
y = x + 5 and x + y = -2 which method would you use?
Answer by Tatiana_Stebko(1539) About Me  (Show Source):
You can put this solution on YOUR website!
system%28y+=+x+%2B+5+%2C+x+%2B+y+=+-2%29
I think better to use the substitute method
substitute y=x%2B5 into the second equation
x%2Bx%2B5=-2
2x=-2-5
2x=-7
x=-7%2F2
x=-3.5 substitute into the first equation of the system
y=-3.5%2B5
y=1.5
Answer (-3.5,1.5)