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Reptile [31]
3 years ago
5

What is the solution to the system of equations? Y=2x-5. -8x-4y= -20

Mathematics
1 answer:
stiv31 [10]3 years ago
5 0
<span>Y=2x-5
 -8x-4y= -20
---------------------------
Substitute 2x-5 for y in </span> -8x-4y= -20
<span>-8x-<span>4<span>(<span>2x-5</span>)</span></span></span>=-<span>20
</span>-16x+20=-<span>20
</span>---------------------------------------
Add -20 on each side
<span>-16x+20+-20</span>=-<span>20+-20
</span>-16x = -40
------------------------------------------------
Divide each side by -16
16x / -16 = -40 / -16
x = 5/2 or 2.5
now we have x
===============================================================
To find Y Substitute 2.5 for X in y=<span><span>2x-</span><span>5
y = 2(2.5)-5
y = 0
---------------------------------------
X = 5/2 or 2.5 and Y = 0</span></span>
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Read 2 more answers
Can someone please help
leonid [27]

Answers:

  • Lateral Area = No lateral area (choice D)
  • Surface Area = 25.97 square inches (choice E)
  • Volume = 12.44 cubic inches (choice A)

============================================

Explanation:

Lateral area only applies to prisms and cylinders. Spheres do not have lateral sides, so there is no lateral area.

-----------------------

The radius is 1 & 7/16

Let's convert this to decimal form

1 & 7/16 = 1 + (7/16)

1 & 7/16 = 1 + 0.4375

1 & 7/16 = 1.4375

The radius is r = 1.4375 inches.

-----------------------

SA = Surface area the sphere

SA = 4*pi*r^2

SA = 4*pi*(1.4375)^2

SA = 25.9672267773281

SA = 25.97 square inches (choice E)

-----------------------

V = Volume of the sphere

V = (4/3)*pi*r^3

V = (4/3)*pi*(1.4375)^3

V = 12.4426294974698

V = 12.44 cubic inches (choice A)

8 0
3 years ago
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3 years ago
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