Question

Solve the system of equations.

http://static.k12.com/bank_packages/files/media/mathml_5a3fde083017c6b0836002347edb9a60dbab0589_1.gif

( , )

Answer 1

replace y in first equation by
y = -x+4 <----by this

Answer 2

then solve
you can do elimination or graphing method
up to you
but there is one equation already solved for y so you can use substitution method