Answer:
x = 9/25, y = 7/25, z = 4/25
Explanation:
step 1: solve for y in first equation to use substitution
y = -2x + 1
step 2: insert into second equation to eliminate y variable and work with two variables
3(-2x+1) + z = 1 (now distribute)
-6x + 3 + z = 1 (bring over the -3)
-6x + z = -2
step 3: now left with -6x + z = -2 and x + 4z = 1, so eliminate z
-6x + z = -2 (multiply by 4)
4(-6x + z = -2)
-24x + 4z = -8
-
x + 4z = 1 (brought down third equation)
-25x = -9
x = 9/25
then just plug in x into the third equation to solve for z, followed by plugging it into the first equation to solve for y. you should end with y = 7/25 and z = 4/25
Answer:
Supermarkets are often cited as among the types of businesses with the lowest profit margins. It's true. Grocery store profit margins typically range from 1 percent to 3 percent, depending on the items. Grocery stores make their money on volume. They may not make much on any one item, but it's the rare shopper who only buys one item. That's why the store kindly provides big shopping carts for their customers. With not much additional effort, the grocery store sells you 20 items or more, making much more profit than they would have if you had bought only one item.Explanation:
