# i need help to answer q in precalculus

Anonymous

Question description

#### Question 1(4 points)

Solve the system of equations by substitution.

Question 1 options:

 B) x = 1, y = 16; (1, 16)

 C) x = -1, y = -8; (-1, -8)

 D) x = 1, y = -8; (1, -8)

#### Question 2(4 points)

Solve the system of equations by elimination.

Question 2 options:

 B) x = -18, y = 5; ( -18, 5)

 C) x = -18, y = 6; (-18, 6)

 D) x = -5, y = 18; (-5, 18)

#### Question 3(4 points)

Solve the system of equations by substitution.

Question 3 options:

 B) x = -2, y = 3; (-2, 3)

 C) x = 3, y = 7; (3, 7)

 D) x = 12, y = -2; (12, -2)

#### Question 4(4 points)

Solve the system of equations. If the system has no solution, say that it is inconsistent.

Question 4 options:

 B) x = 2, y = 3; (2, 3)

 C) x = 2, y = 4; (2, 4)

 D) inconsistent

#### Question 5(4 points)

Verify that the values of the variables listed are solutions of the system of equations.

x = -3, y = 4

Question 5 options:

 B) not a solution

#### Question 6(4 points)

Find the value of the determinant.

Question 6 options:

 B) 75

 C) -45

 D) 33

#### Question 7(4 points)

Solve the system of equations using substitution.

Question 7 options:

 B) x = -4, y = -3; x = -3, y = -4or (-4, -3), (-3, -4)

 C) x = -4, y = 3; x = -3, y = 4or (-4, 3), (-3, 4)

 D) x = 4, y = 3; x = -3, y = -4or (4, 3), (-3, -4)

#### Question 8(4 points)

Graph the system of inequalities.

-2x + y < 4
-2x + y > 1

Question 8 options:

 B)

 C) No solution

 D)

#### Question 9(4 points)

Solve the system of equations by elimination.

Question 9 options:

 B) x = 1, y = 1; (1, 1)

 C) x = 0, y = 1; (0, 1)

 D) x = 1, y = 0; (1, 0)

#### Question 10(4 points)

Solve the system of equations by substitution.

Question 10 options:

 B) x = -7, y = 7; (-7, 7)

 C) x = 6, y = -6; (6, -6)

 D) x = -6, y = 6; (-6, 6)

#### Question 11(4 points)

Graph the system of inequalities.

3x - y ≤ -9
x + 2y ≥ 6

Question 11 options:

 B)

 C)

 D)

#### Question 12(4 points)

Find the value of the determinant.

Question 12 options:

 B) -2

 C) 58

 D) -11

#### Question 13(4 points)

Verify that the values of the variables listed are solutions of the system of equations.

x = -1, y = 6

Question 13 options:

 B) not a solution

#### Question 14(4 points)

Graph the system of inequalities.

y > -2
x ≥ 5

Question 14 options:

 B)

 C)

 D)

#### Question 15(4 points)

Solve the system of equations by substitution.

Question 15 options:

 B) x = 0, y = 0; (0, 0)

 C) x = 1, y = 1; (1, 1)

 D) x = 0, y = 1; (0, 1)

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