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german
2 years ago
9

Solve using Substitution -2x+y=4 -5x+2y=1

Mathematics
1 answer:
slavikrds [6]2 years ago
7 0

Answer:

x=7

y=18

Step-by-step explanation:

y=2x+4

-5x+2(2x+4)=1

-5x+4x+8=1

-x=-7

x=7

-2(7)+y=4

-14+y=4

y=18

plz mark brainliest

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Solve for x write the smaller solution first and the larger solution second. Round to two decimal places (x+8)^2-7=0
siniylev [52]

Answer:

x ≈ - 10.65, x ≈ - 5.35

Step-by-step explanation:

Given

(x + 8)² - 7 = 0 ( add 7 to both sides )

(x + 8)² = 7 ( take the square root of both sides )

x + 8 = ± \sqrt{7} ( subtract 8 from both sides )

x = - 8 ± \sqrt{7} , thus

x = - 8 - \sqrt{7} ≈ - 10.65

x = - 8 + \sqrt{7} ≈ - 5.35

4 0
3 years ago
Dave won a hot dog eating contest by eating 18 hot dogs in 10 minutes. He ate two more than twice the amount of the runner-up. W
IrinaVladis [17]

Answer:

The correct anser is option

B. 2x + 2 = 18

Step-by-step explanation:

Let the number of hot dogs eaten by the runner up be represented by x

If Dave ate 2 more than twice x, this means that the number eaten by him = 2x + 2

Since the total number of hot dogs eaten by Dave is 18

Therefore, the equation will be

2x + 2 = 18

So the number of hot dogs eaten by the runner-up is determined by solving for x

2x= 18-2

2× = 16

x = 16/2

x = 8

The runner up are 8

While Dave are

2×8 + 2 = 18.

8 0
3 years ago
Read 2 more answers
16 is 4% of what number?
IrinaK [193]
16 is 4% of 400 

Change the percentage into a decimal by dividing the decimal over 100:
\frac{4}{100} = 0.04

Divide 16 by the decimal (0.04):
16 \div 0.04 = 400
3 0
3 years ago
What is 423 divided by 898?
KiRa [710]

423 divided by 898 is 0.47104677...

Hope I could help! :)

6 0
2 years ago
Tiffany’s allowance is reduced $1.25 every time she forgets to clean her room.
snow_tiger [21]

Answer:

$8.75 is your answer.

Step-by-step explanation:

What you do is you multiply 1.25 by 7.

<em>1.25 x 7 = $8.75</em>

$8.75 is your answer.

4 0
3 years ago
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