Solve the System by the Substitution Method $$x + y = 1$$

question 242

Multiple Choice

Solve the system by the substitution method.
- $$x + y = 1$$
$x ^ { 2 } + y ^ { 2 } = 16 y - 39$

• A) \(\{ ( - 3,4 ) , ( - 4,5 ) \}\)
• B) \(\{ ( 4 , - 3 ) , ( 5 , - 4 ) \}\)
• C) \(\{ ( 5 , - 4 , ( 6 , - 5 ) \}\)
• D) \(\{ ( - 4,5 ) , ( - 5,6 ) \}\)

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