Easy Pre-Calculus Step-by-Step by Carolyn Wheater
Author:Carolyn Wheater
Language: eng
Format: epub
Publisher: McGraw-Hill Education
Published: 2019-01-02T16:00:00+00:00
Exercise 10.3
Solve each system.
1. 2x + y = 4
4x-3y = 13
2. 2x + 3y = 4
3x-8y = -9
3. 2x + 3y = -8
x + 2y = -3
4. 3x − 7y = 30
5x + y = 12
5. 2x − y = 5
−x + y = -3
6. 5x − 2y = 29
3x + 4y = 33
7. -3x + 4y = −6
5x – 3z = -22
3y + 2z = -1
8. x + 2y − 3z = 5
x – y + 2z = -3
x+y − z = 2
9. x + 2y + 3z = 17
−x − 5y + 4z = 2
2x + 7y − 5z = −1
10.
Step 4. Find Inverse Matrices
In arithmetic, you learned that every nonzero number has a reciprocal and that the product of the number and its reciprocal is 1. The reciprocal of , for example, is , and the product .
What is commonly called the reciprocal is formally called the multiplicative inverse. Two numbers are multiplicative inverses if their product is 1, the identity element for multiplication.
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