Solve the System by the Addition Method $$\left\{ \begin{array} { c } x + 8 y = 15 \\- 2 x + 7 y = - 7\end{array} \right.$$

question 81

Multiple Choice

Solve the system by the addition method. If there is no solution or an infinite number of solutions, so state. Use set
notation to express the solution set.
- $$\left\{ \begin{array} { c } x + 8 y = 15 \\- 2 x + 7 y = - 7\end{array} \right.$$

• A) \(\{ ( 6,2 ) \}\)
• B) \(\{ ( - 7,2 ) \}\)
• C) \(\{ ( 7,1 ) \}\)
• D) no solution; \(\varnothing\)

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The area marked or colored differently than its surroundings, often used in diagrams or graphs to denote a specific area.

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To simplify an expression or equation by multiplying out brackets and combining like terms.

Special Product Formula

Mathematical formulas that provide shortcuts for multiplying certain types of polynomials.

Special Product Pattern

Patterns used in algebra to recognize products of binomials that can simplify multiplication and factoring tasks.