# 1826 question 13

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18/26Select one:a. $$\lbrace{(\frac{3}{4},5)}\rbrace$$ b. { }c. {(0, -7)}d. $$\lbrace{(x,y)| y=16x-7}\rbrace$$; The equations are dependentThe correct answer is: $$\lbrace{(\frac{3}{4},5)}\rbrace$$Question 13Correct8.75 points out of 8.75Solve the system by substitution.$$16x-y=7$$$$8x+5y=31$$
3/9/2020Graded Exam #4Question 14Correct8.75 points out of 8.75Identify the ordered triple that is a solution to the system.$$-2x-4y-6z=16$$$$-8x-7y+7z=-2$$$$4x-3y-7z=-8$$
3/9/2020Graded Exam #4Question 15Correct8.75 points out of 8.75Solve the system. If a system has one unique solution, write the solutionset. Otherwise, determine the number of solutions to the system, anddetermine whether the system is inconsistent, or the equations aredependent.$$-2x-5y+6z=11$$$$-x-2y-7z=-25$$$$7x+5y-7z=16$$
3/9/2020Graded Exam #4Question 16Incorrect0.00 points out of 8.75Find the partial fraction decomposition for the given rational expression.Use the technique of Gaussian elimination to ±nd A, B, and C. $$\frac{-3x^2+7x-10}{(x+2)(x-1)^2}=\frac{A}{x+2}+\frac{B}{x-1}-\frac{C}{(x-1)^2}$$Select one:
3/9/2020Graded Exam #422/26Select one:a. {(-4.49, -6.63, 2.49)}b. {(6.18, -11.2, 7.82)}c. {(-15.61, -1.39, -2.84)}d. {(7.91, -1.03, 3.18)}The correct answer is: {(6.18, -11.2, 7.82)}Question 17Correct8.75 points out of 8.75Use a calculator to approximate the reduced row-echelon form of theaugmented matrix representing the given system. Give the solution setwhere x, y, and z are rounded to 2 decimal places.0.52x-3.79y-4.67z=9.150.03x+0.06y+0.13z=0.530.974x+0.813y+0.419z=0.189
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