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4 years ago

PLEEEASE HELLLLP!!!!!!! If x+7=2y and y=2x−1, what is the value of y?

Mathematics

1 answer:

viktelen [127]4 years ago

6 0

Answer:

Step-by-step explanation:

We can add 1 to both sides of the second equation and divide by 2 to get

x = (y-1)/2

We can then substitute x in the first equation to get

(y-1)/2 + 7 = 2y

Multiply by 2

y-1 + 14 = 2y

Subtract y and combine like terms

y = 13

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Mr. smith earns 6% commission on every house he sells. if he earns $9,000, what was the price of the house?

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3 years ago

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Gnesinka [82]

Answer:

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Step-by-step explanation:

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3 years ago

Hi can someone please help me.

Dafna11 [192]

Answer:

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Step-by-step explanation:

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4 years ago

Complete the square for 5x^2+10x-16. first one to answer gets brainiest

ella [17]

Answer: x= -1 + √(21/5)

Step-by-step explanation:

The given equation can be written as 5x^2+10x-16=0

keep the x terms on one side and constant on another side

5x^2+ 10x = 16.

Now, to make a complete square like (x+a)^2 = x^2+2xa+a^2.

Divide the given equation by 5 on both sides,

The equation now becomes x^2+2x = 16/5.

The middle term is 2xa=2x

By solving for term "a" in above equation, a= 1

The entire equation of complete square should be x^2+2x+1, which is equal to (x+1)^2

Here, in the equation given in question, +1 is missing to make a complete square.

In order to add 1 we have to simultaneously minus 1 to keep the values in the equation unchanged.

Thus, x^2+2x+1-1 =16/5.

Again moving the constant -1 to other side, we have

x^2+2x+1 =16/5+1

After simplification,

(x+1)^2= 21/5

Taking square root on both sides,

(x+1)= + √(21/5)

The answer is x= -1 + √(21/5)

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3 years ago

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quester [9]

Answer:

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3 years ago