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3 years ago

14

What is the x-coordinate at the point of intersection for these equations?

2 answers:

DerKrebs [107]3 years ago

7 0

Think of the given

<span>f(x) = 2.8x - 12
g(x) = 5.8x + 9

as

</span><span>y = 2.8x - 12
y = 5.8x + 9

We want the value of x, not the value of y. So, subtract the 2nd equation from the first. Doing so will eliminate the variable y and leave you with one equation in the variable x. Solve for this x value.
</span><span>
y= 2.8x - 12
-y =-(5.8x + 9)
--------------------
0 = -3x - 21 What is the value of x?</span>

DerKrebs [107]3 years ago

4 0

Answer:

A) x = -7 .

Step-by-step explanation:

Given : f(x) = 2.8x - 12

g(x) = 5.8x + 9.

To find : What is the x-coordinate at the point of intersection for these equations.

Solution : We have given that

y = 2.8x - 12 ------- ( equation 1)

y = 5.8x + 9--------( equation 2)

On subtracting equation 2 from equation 1.

y = 2.8x - 12

(-)y = (-)5.8x +(-) 9

______________

0= - 3x - 21

On adding 21 both sides

21 = -3x

On dividing both sides by -3 and switching sides .

x = -7 .

Therefore, x = -7 .

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BigorU [14]

The equation has one extraneous solution which is n ≈ 2.38450287.

Given that,

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According to the question,

An extraneous solution is a solution value of the variable in the equations, that is found by solving the given equation algebraically but it is not a solution of the given equation.

To solve the equation cross multiplication process is applied following all the steps given below.

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The roots (zeros) are the x values where the graph intersects the x-axis. To find the roots (zeros), replace y

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n ≈ 2.38450287

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For more information refer to the link.

brainly.com/question/15070282

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