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marta [7]
3 years ago
8

If 5x – 3y = 1 and x - 2y = - 4, then xy = ? . A 5 B 4 © 6 D 8 E 9

Mathematics
2 answers:
Amanda [17]3 years ago
6 0

Answer:

6

The answer is C:6

Drupady [299]3 years ago
4 0
Yeah answer C is right because from question,
5x -3y=1......eq 1
x-2y=-4 ......eq2
From equation 2 too we can write
x = -4 + 2y ... put this x value on eq 1 so
5(-4+2y) - 3y = 1
-20 + 10y -3y=1
Or, 7y=21
So y=21/7=3
And put the value of y on equation 2
x -2 X 3 =-4
Or x= -4+6
So x=2 answer from question too we get value of x and y is 2,3 so
xy= 2X3=6 answer
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3 years ago
Y = -5x - 8<br> y = 4x + 1
vodka [1.7K]

Answer:

X= -1

Y= -3

Step-by-step explanation:

y=-5x-8

y=4x+1

-5x-8=4x+1

+5x. -1 +5x -1

-9=9x

-1=x

Y=4(-1)+1

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3 0
4 years ago
each cube inside the rectangular prism has an edge length 3/4 inch.What is the volume of the rectangular prism?
NNADVOKAT [17]

Answer:

\frac{27}{64}n\,\,cubic\,\, inches

Step-by-step explanation:

Given: Edge length of cube = \frac{3}{4}\,\,inch

To find: Volume of the rectangular prism

Solution:

A cube is a three-dimensional solid object which has 12 edges, 8 vertices and 6 faces.

A rectangular prism is a solid three-dimensional object which has six faces that are rectangles.

Let n denotes number of cubes inside the rectangular prism

Volume of one cube = (edge)^3=(\frac{3}{4})^3 =\frac{27}{64}  cubic inches

So, volume of rectangular prism = volume of n cubes =  \frac{27}{64}n\,\,cubic\,\, inches

5 0
3 years ago
24 POINTSSS for anyone who answers The of a square garden is 36x^2 -60+25 find the perimeter if x=3
Misha Larkins [42]

Answer:

The perimeter is 52

Step-by-step explanation:

The area is 36x^2 -60x+25

We set this equal to 0 to find the length and width

A= 36x^2 -60x+25

We notice that this is a perfect square trinomial

(a^2 -2ab-b^2) = (a-b)^2

let a = 6x  and b=5

A=(6x-5) (6x-5)

The length and width are the same since is it a square  (we know it is a square so they have to be equal)

The perimeter of a square is

P =4s

P =4 (6x-5)

Distribute the 4

  = 24x -20

Let x =3

P = 24(3) -20

  =72 -20

 = 52

The perimeter is 52

5 0
4 years ago
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