Explanation Given information: Given ordered pair is ( − 1 , 1 ) and system is − x + y = 2 , 2 x − y = − 3 Calculation: An ordered pair is said to be the solution of a system if it satisfies all the given equations. Plugging the ordered pair in the first equation: − x + y = 2 − ( − 1 ) + ( 1 ) = 2 1 + 1 = 2 2 = 2 Hence, the ordered pair satisfies the first equation

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ISBN: 9780134654409

Author: Martin-Gay, K. Elayn, 1955-

Publisher: Pearson,

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Chapter 7, Problem 13CR

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To determine if the given ordered pair is a solution to the given system.

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Chapter 7, Problem 12CR

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1. Matrix Operations Given: A = [ 33 ]A-[3-321] -3 B = [342]B-[3-41-2] (a) A² A2 Multiply A× A: -3 = (3 x 32x-3) (3 x 22 x 1) | = |[19–63 |-9-3 -6+21] = A² = 33 33 1-3×3+1x-3) (-3×2+1x1) [12]A2=[3-321][3-321]=[(3×3+2x-3)(-3×3+1x-3)(3×2+2×1)(-3×2+1×1)]=[9-6-9-36+2-6+1 ]=[3-128-5] (b) | A ||A| Determinant of A | A | (3 × 1) (2 x-3)=3+ 6 = 9|A|=(3×1)-(2x-3)=3+6=9 (c) Adjoint of A Swap diagonal elements and change sign of off-diagonals: A = [33], so adj (A) = |¯²]A=[3-321], so adj(A)=[13–23] -3 (d) B-¹B-1 First find | B ||B|: |B | (3x-2)- (1 × -4) = -6 + 4 = −2|B|=(3x-2)-(1x-4)=-6+4=-2 Then the adjoint of B: adj (B) = [² 3 adj(B)=[-24-13] Now, B-1 1 = |B| · adj (B) = 1 [²¯¯³¹³] = [2₂ B 0.5 |B-1=|B|1-adj(B)=-21[-24-13]=[1-20.5-1.5] 2. (a) Matrix Method: Solve (2x + 3y = 6 (2x-3y=14 {2x+3y=62x-3y=14 Matrix form: 22 33-22 = [223-3][xy]=[614] Find inverse of coefficient matrix: Determinant: | M | (2x-3) - (3 x 2) = -6 -6 = -12|M|=(2x-3)-(3×2)=-6-6=-12 Adjoint: adj(M) = [3]adj(M)-[-3-2-32] So…

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if the given ordered pair is a solution to the given system.

Solution Summary: The author explains that an ordered pair is said to be the solution of a system if it satisfies all the given equations.

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Chapter 7 Solutions