CPM Homework Help : A2C Problem 11-72

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

11-72.

Solve for x and y in each system below. Homework Help ✎
1. 2x + y = 12
  xy = 16
2. 2x + y = 12
  xy = 20
3. Explain how the graphs of (a) and (b) relate to the solutions to each system of equations.

Hint (a):

Solve for y in one of the equations and substitute.

More Help (a):

y = 12 − 2x

$y=\frac{16}{x}$

Answer (b):

(2, 8) and (4, 4)

Hint (b):

See part (a).

Answer (b):

(3 + i, 6 − 2i) and (3 − i, 6 + 2i)

Hint (c):

What does it mean if the solutions contain i?

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