By S. Kusuoka, A. Yamazaki

A lot of financial difficulties can formulated as restricted optimizations and equilibration in their ideas. a number of mathematical theories were delivering economists with imperative machineries for those difficulties bobbing up in financial conception. Conversely, mathematicians were inspired by means of a variety of mathematical problems raised through monetary theories. The sequence is designed to collect these mathematicians who have been heavily attracted to getting new demanding stimuli from monetary theories with these economists who're looking for potent mathematical instruments for his or her researchers.

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**Sample text**

Choose an equation. − 2(0) = x −3 2( 4) = x − 3 8. Substitute. − 0= x −3 8= x −3 = x 3= x −5 9. Write ordered pairs. (3,0) and ( − 5, − 4 ) satisfy the system of equations given. MATHEMATICS 30 TEACHER CERTIFICATION STUDY GUIDE − 2. 9x 2 + y 2 = 16 Use elimination to solve. 5x 2 + y 2 = 30 − 9x 2 + y 2 = 16 − − 2 14 x 2 = −14 x2 = 1 x = ±1 2 −9 (1) + y= 16 − 1. Multiply second row by − 1. 2. Add. 3. Divide by −14 . 4. Take the square root of both sides − 5x − y = 30 2 2 − 9 ( −1) + y= 16 − 9= +y 16 2 9= +y 16 2 = y 2 25 = y 2 25 y= ±5 y= ±5 ( −1, ±5) (1, ±5) (1, ±5 ) MATHEMATICS and ( -1, ± 5 ) 31 5.

Ziffel bought 3 cows and 12 sheep for $2400. If all the cows were the same price and all the sheep were another price, find the price charged for a cow or for a sheep. Let x = price of a cow Let y = price of a sheep Then Farmer Greenjeans' equation would be: 4 x + 6 y = 1700 Mr. Ziffel's equation would be: 3 x + 12y = 2400 To solve by addition-subtraction: Multiply the first equation by −2 : −2(4 x + 6 y = 1700) Keep the other equation the same: (3 x + 12y = 2400) By doing this, the equations can be added to each other to eliminate one variable and solve for the other variable.

3 8 7 + 2 − 1 3 2 − 4 8 2+8 −4 + 2 8+3 10 − 2 11 2. 8 7 1 − 1 = − 2 − 3 + ( −1) 7 + ( −1) − 1 + ( − 2) Add corresponding elements. 2 6 − 3 Simplify. 1 3 6 − = 4 −5 1 − 6 Change all of the signs in the = − 1 second matrix and then add the two matrices. 8 + ( − 3) −1 + ( − 6) Simplify. = 7+5 4 + ( −1) 8 7 5 12 MATHEMATICS − 1 3 + 4 5 − − 7 3 − 50 TEACHER CERTIFICATION STUDY GUIDE Practice problems: 1.