Question

1. Solve the system by elimination.
x + 5y - 4z = -10
2x - y + 5z = -9
2x - 10y - 5z = 0
A. (5, –1, 0) B. (–5, 1, 0) C. (–5, –1, 0)** D. (–5, –1, –2)

2. Solve the system by substitution.
2x – y + z = -4
z = 5
-2x + 3y - z = -10
A. (-8, 7, 5)** B. (-8, -7, 5) C. (8, –7, 5) D. (-8, -7, -5)

3. A food store makes a 11-lb mixture of peanuts, almonds, and raisins. The cost of peanuts is $1.50 per pound, almonds cost $3.00 per pound, and raisins cost $1.50 per pound. The mixture calls for twice as many peanuts as almonds. The total cost of the mixture is $21.00. How much of each ingredient did the store use?
A) 3 lbs. peanuts, 6 lbs. almonds, 2 lbs. raisins B) 8 lbs. peanuts, 1 lb. almonds, 2 lbs. raisins C) 6 lbs. peanuts, 3 lbs. almonds, 2 lbs. raisins** D) 8 lbs. peanuts, 2 lbs. almonds, 1 lb. raisins

Someone pls check my answers ASAP. I'm very lost! Thanks :)

Answer 1

idk

Answer 2

It's
C
B
C
100%

Answer 3

1 is wrong, 2&3 remain correct