For Exercises 109-112, solve the equation in part (a) and verify the solution on a graphing calculator. Then use the graph to find the solution set to the inequalities in parts (b) and (c), Write the solution sets to the inequalities in interval notation. (See Example 9) a. | 2 x − 3.8 | − 4.6 = 7.2 b. | 2 x − 3.8 | − 4.6 ≥ 7.2 c. | 2 x − 3.8 | − 4.6 ≤ 7.2
For Exercises 109-112, solve the equation in part (a) and verify the solution on a graphing calculator. Then use the graph to find the solution set to the inequalities in parts (b) and (c), Write the solution sets to the inequalities in interval notation. (See Example 9) a. | 2 x − 3.8 | − 4.6 = 7.2 b. | 2 x − 3.8 | − 4.6 ≥ 7.2 c. | 2 x − 3.8 | − 4.6 ≤ 7.2
Solution Summary: The author explains how to calculate the solution set of the inequality left|2x-3.8right|-4.6=7.2.
For Exercises 109-112, solve the equation in part (a) and verify the solution on a graphing calculator. Then use the graph to find the solution set to the inequalities in parts (b) and (c), Write the solution sets to the inequalities in interval notation. (See Example 9)
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Determine if the values of the variables listed are solutions of the system of equations.
2x - y = 4
3x+5y= - 6
x=1, y = 2; (1,-2)
Is (1, 2) a solution of the system of equations?
L
No
Yes
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10. A sound wave's amplitude can be modeled by the function y = −7 sin ((x-1) + 4). Within the interval 0 < x < 12, when does the function have an amplitude
of 4? (Select all that apply.)
9.522 seconds
4.199 seconds
0.522 seconds
1.199 seconds
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