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Tatiana [17]
3 years ago
7

To solve this system of equations by elimination what operation would we use to eliminate the X variable and find the value of y

Mathematics
1 answer:
Vadim26 [7]3 years ago
5 0

Answer:

Option A is correct.

Step-by-step explanation:

We have to eliminate x from the given system of equations by solving

-6x -4y=2

-4x-7y=2

We can do this by subtracting 3 times the second equation from 2 times the first equation we get

-12x -8y = 2

12x +21y =- 2

Sign of second equation changed because it is getting  subtracted

Since, we got same quantity of x with opposite signs

Hence, it will get cancelled and so eliminated.

Therefore, Option A is correct.

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A soccer ball is kicked from ground level. The function y = -12x (x - 6) shows the height in feet) of the
enot [183]

Answer:

6 seconds

Step-by-step explanation:

Given

y = - 12x(x - 6)

When the ball hits the ground then height of ball is zero

let y = 0 , that is

- 12x(x - 6) = 0

Equate each factor to zero and solve for x

- 12x = 0 ⇒ x = 0 ← when ball is first kicked

x - 6 = 0 ⇒ x = 6 ← when the ball hits the ground.

The ball hits the ground after 6 seconds

8 0
3 years ago
A child weighs 44 lbs. The physician orders a medication for 10 mg/Kg/day. What do you give per day? (Use 0.45 for your conversi
Bond [772]

Answer:

198 mg

Step-by-step explanation:

A child weighs 44 lbs.

Step 1

We convert the child's weight to kg

1 Ibs = 0.45kg

44 Ibs = x

Cross Multiply

1 Ibs × x = 44 Ibs × 0.45 kg

x = 44 Ibs × 0.45 kg/1 Ibs

x = 19.8 kg

Step 2

The physician orders a medication for 10 mg/Kg/day.

From the above statement, we know that:

10mg = 1 kg

Hence, what you give per day is calculated as:

1 kg = 10 mg

19.8kg = x

Cross Multiply

1 kg × x = 19.8kg × 10mg

x = 19.8kg × 10mg/1kg

x = 198mg

Therefore, what you will give per day to a child of 19.8kg(44 Ibs) is 198mg per day

3 0
3 years ago
The low temperature was -1.8 C yesterday and -2.1 C today. Use the symbols < or > to show the relationship between the tem
Free_Kalibri [48]
I don’t really know what the question is looking for but -1.8 C > -2.1C
5 0
3 years ago
Read 2 more answers
Explain how to find the average rage of change for a function over a given interval.
svp [43]

The average rate of change for a function over an interval is the slope

<h3>How to explain the steps?</h3>

Take for instance, we have the function to be

Function f(x)

And the interval is (a,b)

The average rate of change for the function over the interval is

Rate = (f(b) - f(a))/(b - a)

The above represents the slope

Take for instance, we have:

f(x) = x^2 [2, 4]

We have:

f(2) = 2^2 = 4

f(4) = 4^2 = 16

So, we have:

Rate = (16 - 4)/(4 - 2)

Rate = 6

Read more about average rate of change at:

brainly.com/question/8728504

#SPJ1

8 0
2 years ago
If x=5^a, find the value of 5x
Harrizon [31]

Answer:

The given expression is written as 5^{1+a}

Step-by-step explanation:

Given as :

The expression is written as  x = 5^{a}

Now foe 5 x , the expression is written as

5^{1} × 5^{a}

Now <u>from base indices method </u>

here base is same so, power should be added

∴ 5^{1+a}

Hence The given expression is written as 5^{1+a} , Answer

8 0
4 years ago
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