CPM Homework Help : INT1 Problem 7-38

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Home > INT1 > Chapter 7 > Lesson 7.1.3 > Problem 7-38

7-38.

Solve the systems of equations below.

Hint:

Read the Math Notes box in Lesson 6.2.3 to review the Substitution Method. Use it to solve both parts.

More help:

Read the Math Notes box in Lesson 6.4.1 to review the different types of solutions for systems of equations.

$2x + 2y = 18$
$x = 3 − y$

Step 1(a):
Substitute $(3 − y)$ in for $x$ , in the equation $2x + 2y = 18$ , so $2(3 − y) + 2y = 18$ .
Step 2(a):
Solve for $y$ .
Step 3(a):
Substitute the value for $y$ into either of the original equations. Solve for $x$ .
Answer (a):
No Solution because when solving for $y$ , the equation shows $6 = 18$ and $6 ≠18$ .

$c = −b − 11$
$3c + 6 = 6b$

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