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4 years ago

Can someone plz help me with this one problem this is my last question!

Mathematics

2 answers:

Solnce55 [7]4 years ago

7 0

It’s yes I think I’ve seen this question before

Marysya12 [62]4 years ago

3 0

Im not sure but i think yes

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- 2x+2y = -4 3х + Зу = -18 х = y =

Anna35 [415]

Answer: x= -2 y= -4

substitute the given values of x into the equation 3x+3y=-18

y substitute the given value of y into the equation x=2y

since all the equalities are true the ordered pair is the solution of the system

4 0

3 years ago

Item 1

omeli [17]

Answer:

-2(x)>30

An inequality is a relation which makes a non-equal comparison between two numbers or other mathematical expressions.

x<-15

Step-by-step explanation:

-2(x)>30 means to divide -2 on both sides which is -15.

x>-15

Next you switch the inequality because you multiplied by a negative:

x<-15

6 0

3 years ago

Jessie is fencing in a rectangular plot outside of her back door so that she can let her dogs out to play. She has 60 feet of fe

DerKrebs [107]

Answer:

Dimensions are length 15 feet and width 30 feet.

Maximum area of the plot is 450 feet².

Step-by-step explanation:

Let the length of the plot = x feet and width = y feet.

Since, the amount of fencing to be applied on the three sides of the plot is 60 feet.

We have,

$2x + y = 60$ i.e. $y=60-2x$

Now, Area of the rectangular plot = Length × Width

i.e. Area of the rectangular plot = $x \times y$

i.e. Area of the rectangular plot = $x\times (60-2x)$

i.e. Area of the rectangular plot = $-2x^2+60x$

Since, the maximum of the quadratic equation $ax^2+bx+c$ will be obtained at $x= \frac{-b}{2a}$ .

Then, the maximum of the area of the plot is at the point $x= \frac{-60}{2\times (-2)}$ i.e. x= 15

Then, maximum area of the rectangular plot = $-2x^2+60x$

i.e. maximum area of the rectangular plot = $-2\times 15^2+60\times 15$

i.e. maximum area of the rectangular plot = -450+900 = 450 feet²

Hence, Maximum area of the plot is 450 feet².

Then, $y=60-2\times 15$ implies $y=60-30$ i.e. y= 30.

Hence, the maximum area is enclosed by the length 15 feet and width 30 feet.

6 0

4 years ago

How many solutions does this set of equations have 7x − 7y = -6,13x − 9y = 16

QveST [7]

Well they each have 3 solutions

The solutions to 7x-7y=-6 are:

Slope=1
X-intercept= - 6/7=-0.85714
Y-intercept= 6/7= 0.85714

The answers to 13x-9y=16 are:

Slope=2.889/2.000=1.444
X-intercept=16/13=1.23077
Y-intercept=16/-9=1.77778
Hope i could help you

8 0

3 years ago

Suppose you want to be sure that the total cost of the three items does not go over a certain amount. How can you use estimation

Bond [772]

Answer:

i don't konw

Step-by-step explanation:

5 0

3 years ago