Solve the System for X and Y Using Cramer's Rule $\begin{array} { l } x + a y = \frac { 1 } { a } \\x + b y = \frac { 1 } { b }\end{array}$

question 147

Multiple Choice

Solve the system for x and y using Cramer's rule. Assume a and b are nonzero constants.
$\begin{array} { l } x + a y = \frac { 1 } { a } \\x + b y = \frac { 1 } { b }\end{array}$

• A) \(\left\{ \left( b + a , - \frac { 1 } { a b } \right\} \right\}\)
• B) \(\left\{ \left( \frac { 1 } { a b } , \frac { a - b } { a b } \right\} \right\}\)
• C) \(\left\{ \left( \frac { a + b } { a b } , - \frac { 1 } { a b } \right) \right\}\)
• D) \(\left\{ \left( \frac { b - a } { a b } , - \frac { 1 } { a b } \right) \right\}\)

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The discount rate at which the net present value of an investment project is zero; the rate of return of a project over its useful life.

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