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2 years ago

Tind the variable of y x=3y

Mathematics

1 answer:

Morgarella [4.7K]2 years ago

7 0

x=3y

Switch sides

3y=X

Divide 3 both sides to get

T= x/3

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1.) Use the quadratic formula to solve the equation. If necessary, round to the nearest hundredth .x squared minus 21 x equals n

Andrew [12]

Part 1
We are given $x^2-21x=-4x$ . This can be rewritten as $x^2-18x=0$ .
Therefore, a=1, b=-18, c=0.
Using the quadratic formula
$x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}=\frac{-\left(-18\right)\pm \sqrt{\left(-18\right)^2-4\left(1\right)\left(0\right)}}{2\left(1\right)}$
$x=\frac{18\pm 18}{2}$

The values of x are
$x_1=\frac{18-18}{2}=0$
$x_2=\frac{18+18}{2}=18$

Part 2
Since the values of y change drastically for every equal interval of x, the function cannot be linear. Therefore, the kind of function that best suits the given pairs is a quadratic function.

Part 3.
The first equation is $y=x^2+2$ .
The second equation is $y=3x+20$ .

We have
$x^2+2=3x+20$
$x^2-3x-18=0$
Factoring, we have
$\left(x-6\right)\left(x+3\right)=0$
Equating both factors to zero.
$x_1-6=0\rightarrow x_1=6$
$x_2+3=0\rightarrow x_2=-3$

When the value of x is 6, the value of y is
$y=3\left(6\right)+20=38$

When the value of x is -3, the value of y is
$y=3\left(-3\right)+20=11$

Therefore, the solutions are (6,38) or (-3,11)

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2 years ago

Solve 3[-x + (2 x + 1)] = x - 1.

Viktor [21]

The answer is -1. First you distribute the 3. Then u distribute the 3 again to the parentheses. Then solve it from there

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2 years ago

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Simple....

you have: (3.2*103)+(5.78*105)

You want to simplify it..but first remember your order of operations...

1.) Remove the parentheses-->>

(3.2*103)=329.6

and

(5.78*105)=606.9

Which leaves you with...

329.6+606.9=

=936.5

Thus, your answer.

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2 years ago

Which statement is true about the equations 3x + 4y = 12 and ¿-X- = = 1?

jarptica [38.1K]

Answer:

cfhjytgfhe5tgnbg5etjgnbg345jthgbyu6jtngfyu6jyh

Step-by-step explanation:

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2 years ago

Helen rolls a dice and flips a coin. <br> calculate the probability

butalik [34]

Answer:

1/12

Step-by-step explanation:

dice rolling=1/6

coin flipping=1/2

Hence probability=1/6×1/2

4 0

1 year ago

Read 2 more answers