I need some help with Algebra, 10 points

-some questions are skipped-

6. A system of equations that has at least one solution is called inconsistent.

A. true
B. false


7. If a 7% saline solution and a 4% saline solution are mixed to make 500 milliliters of a 5% saline solution, how much of each solution, to the nearest milliliter, is needed?

A. 167 milliliters of 7% solution and 333 milliliters of 4% solution
B. 110 milliliters of the 10% solution and 210 milliliters of 4% solution
C. 155 milliliters of the 10% solution and 300 milliliters of 4% solution
D. 170 milliliters of the 10% solution and 340 milliliters of 4% solution


8. If a system has exactly one solution it is called _______________.

A. consistent
B. inconsistent
C. independent
D. dependent


9. Solve the following system of equations by using the elimination method.
-4x – 2y = -12
4x + 8y = -24

A. (5, 3)
B. (-6, -6)
C. (3, 1)
D. (6, -6)

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11. Solve the following system of equations by using the substitution method.
y = x + 3
y = 2x – 4

A. (-7, -1)
B. (7, 10)
C. (10, -7)
D. (2, 7)

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14. A system of equations that has no solution is called inconsistent.

A. true
B. false





15. Solve the following system of equations using matrices.
4x + 5y = -7
3x – 6y = 24

A. (1, 4)
B. (2, -3)
C. (5, 6)
D. (3, 4)

6. false

7. A. 167 milliliters of 7% solution and 333 milliliters of 4% solution

8.C. independent

9. D. (6, -6)

11. B. (7, 10)

14. true

15. B. (2, -3)

Too many questions