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EleoNora [17]
3 years ago
13

Solve 7x+5y=40 2x+4y=-4 by elimination

Mathematics
1 answer:
Svetach [21]3 years ago
4 0
Step 1 solve for one variable

2x = -4 - 4y

x = -2 - 2y

Step 2 eliminate by substituting into second equation and solve

2 * (-2-2y) + 5y = 40

-4 - 4y + 5y = 40

y = 36

Step 3 put y into any original equation

7x + 5*36 = 40

7x + 180 = 40

7x = -140

x = -20

So

X = -20 and Y = 36
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The product of two positive numbers is 35 and their difference is 2. What is the sum of the two numbers.
tigry1 [53]
7×5=35
7-5=2
The two numbers are 7 and 5
4 0
3 years ago
Read 2 more answers
Courtney is twice as old as Andre and three years older than Natalie. Courtney is half Shari's age. The difference between Shari
lesantik [10]

The question does not seem complete, but I'll represent the statement mathematically and look for their ages each. This is because the worst they can ask for is their ages.

Let C stand for Courtney's age, A for Andrei's age, N for Natalie's age and S for Shari's age. From the question we can deduce the following:

C = 2A

C = N + 3

C = S/2

S - N = C + A

S = 2C, N = C - 3 and A = C/2, therefore we have

2C - (C - 3) = C + C/2

C + 3 = C + C/2

C/2 = 3 and C = 6

A = C/2

A= 6/2

A = 3

N = C - 3

N = 6 - 3

N = 3

S = 2C

S = 2 x 6

S = 12.

C = 6, A = 3, N = 3 and S = 12

8 0
3 years ago
Pls help me solve this thank u
zaharov [31]

Answer:

1. 12

2. 32

3. 8

4. 1

5. 14

Step-by-step explanation:

The above numbers represent the empty boxes from top to bottom.

1. (.4 +1.6) = 2 x 6 = 12

2. (24 ÷ 3 x 4) = 8 x 4 = 32

3. 8 ÷ (9-5) + 3 x 2. You have to remember Order of Operations on this one.

8 ÷ 4 + 3 x 2

2 + 6 = 8

4. 28 ÷ 7 x 1/4

4 x 1/4 = 1

5. (6 x 5) - (4 x 4)

30 - 16 = 14

hope this helps, brainliest is always appreciated.

7 0
4 years ago
a map shows that the top of a hill is 200m above sea level and the bottom of a lagoon is 15m below sea level. express these dist
Rus_ich [418]

Answer:

200 m

-15 m

215 m

Step-by-step explanation:

Given :

Top of hill = 200 m above sea level ; height of hill top is positive 200m = 200 m

Bottom of lagoon = 15m *below sea level ; bottom of lagoon = - 15m

We have related the height of the two points with respect to sea level ; points above sea level are represented as positive ; points below are represented as negative.

Difference between the two heights :

Hill top - bottom of lagoon :

200 m - (-15) m

200 m + 15 m

215 m

Difference between the heights is 215 m

3 0
3 years ago
How do i solve this???? help please
pogonyaev
First ne is 3x then 2x then 26x
5 0
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