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stellarik [79]
3 years ago
8

3x+y=4 2x+y=5 solve using linear combination

Mathematics
2 answers:
Advocard [28]3 years ago
3 0
Idk what linear combination is but you can solve this way:
3x+y=4
-2x-y=-5
x=-1
3(-1)+y=4
-3+y=4
y=7
So x=-1 and y=7
BabaBlast [244]3 years ago
3 0

Answer:

(-1,7)

Step-by-step explanation:

Add the equations in order to solve for the first variable. Plug this value into the other equations in order to solve for the remaining variables.

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Sonja [21]
You take the difference of the numbers.
8 0
3 years ago
Read 2 more answers
How would I start to solve number 15? Would I use distributive property?
natita [175]
-5-x=2x-(4x+6)

Using the distributive property is the correct first step. (4x+6) is being multiplied by -1, so distributing gives

-5-x=2x+(-4x-6)
-5-x=2x+((-4x)+(-6))

Now, using the associative property of addition, you get

-5-x=(2x+(-4x))+(-6)
-5-x=(2x-4x)-6

Simplify the right hand side:

-5-x=-2x-6

Add 5 and 2x to both sides.

(2x+5)-5-x=(2x+5)-2x-6

On the left side, use the associative property. On the right, commutativity and associativity:

2x+(5-5)-x=5+(2x-2x)-6

Simplify.

2x-x=-1
x=-1
8 0
3 years ago
Which is greater: 75% of 56 or 114.8 divided by 2.8? Explain how you know.
Umnica [9.8K]

Answer:

<em>114.8</em>

Step-by-step explanation:

When you divide 75% and 2.8 you get 0.2678

When you divide 56 and 2.8 you get 20

When you divide 114.8 and 2.8 you get 41

So the greatest number divided by 2.8 is <em>114.8</em>

3 0
2 years ago
What is the simplified expression
Nady [450]

Answer:

7y - 4x

Step-by-step explanation:

Given

- 3(2x - y) + 2y + 2(x + y) ← distribute both parenthesis

= - 6x + 3y + 2y + 2x + 2y ← collect like terms

= - 4x + 7y

= 7y - 4x

4 0
2 years ago
A commuter airline makes lattes in the galley and sells them to passengers. A regular latte contains a shot of espresso, 1 cup o
Alik [6]

Answer:

To maximize profit, the amount of each type of coffees made are;

The number of regular latte made = 52 cups

The number of low-fat latte made = 48 cups

Step-by-step explanation:

The given parameters are;

The number of espresso in a regular latte = 1 shot

The number of cups of 2% milk in regular latte = 1 cup

The amount of whipped cream in a regular latte = 0.5 cup

The number of cups of skim milk in the low-fat latte = 1.25 cup

The number of espresso in a low-fat latte = 1 shot

The amount of whipped cream in a low-fat latte = 0 cup

The number of cups of espresso in the journey = 100 shots

The number of cups of skim milk in the journey = 60 cups

The number of cups of 2% milk in the journey = 60 cups

The amount of profit the airline makes on each regular latte = $1.58

The amount of profit the airline makes on each low-fat latte = $1.65

Let 'x' represent the number regular lattes made and let 'y' represent the number low-fat lattes made, we have;

x ≤ 30/0.5 = 60

x ≤ 60

y ≤ 60

y ≤ 60/1.25 = 48

∴ y ≤ 48

x + y ≤ 100

Therefore, the given that more profit is made from the sale of low-fat latte than for regular latte, the maximum number of low-fat latte should be made

Therefore, the number of low-fat latte made, y = 48

Therefore, the number of regular latte made, x ≤ 100 - 48 = 52

For maximum profit, the maximum number of low-fat latte, 'x', should be made

Therefore, x = 52

The ideal mix of regular and low-fat lattes to maximize profit is 52 cups of regular latte and 48 cups of low-fat latte

5 0
3 years ago
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