### Home > A2C > Chapter Ch11 > Lesson 11.2.3 > Problem 11-72

11-72.

Solve for

*x*and*y*in each system below. Homework Help ✎2

*x*+*y*= 12

*xy*= 162

*x*+*y*= 12

*xy*= 20Explain how the graphs of (a) and (b) relate to the solutions to each system of equations.

Solve for *y* in one of the equations and substitute.

*y* = 12 − 2*x*

(2, 8) and (4, 4)

See part (a).

(3 + *i*, 6 − 2*i*) and (3 − *i*, 6 + 2*i*)

What does it mean if the solutions contain *i*?