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Solving for 3 variables questions :o help! Solve the system by elimination 1: x+5y-4z=-10, 2x-y+5z=-9, 2x-10y-5z=0 . 2. Solve the system by substitution: 2x-y+z=-4, z=5, -2x+3y-z=-10. 3. A food store makes a 11–pound 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?

Mathematics
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options for the 1st one are : (5, –1, 0) (–5, 1, 0) (–5, –1, 0) (–5, –1, –2) Options for the second are: (–8, 7, 5) (–8, –7, 5) (8, –7, 5) (–8, –7, –5) And the 3rd : 3 lbs peanuts, 6 lbs almonds, 2 lbs raisins 8 lbs peanuts, 1 lb almonds, 2 lbs raisins 6 lbs peanuts, 3 lbs almonds, 2 lbs raisins 8 lbs peanuts, 2 lbs almonds, 1 lbs raisins

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