Question

solve each system graphically. if a system has an infinite number of solutions, use set-builder notation to write the solution set. If a system has no solution, state this.
y = 2 - x
2x + 2y = 4

Answer 1

y = 2-x or x+y = 2

2x+2y = 4
x+y = 2

the two equations are the same
so there is an infinite number of solutions.