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3 years ago

PLEASE PLEASE HELP SOLVE THE EQUATION USING ELIMINATION 3x+8y=-5 -2x+2y=18

Mathematics

1 answer:

frosja888 [35]3 years ago

5 0

Answer:

Step-by-step explanation:

3x+8y=-5

-2x+2y=18

Ok, so you want to get either x or y to cancel out so lets multiply the first equation by 2 and the second equation by 3.

6x+16y=-10

-6x+6y=54

Now x can cancel out. The new equation is:

22y=44

y=2

Now you input 2 into one of the original problems.

-2x+2(2)=18

-2x+4=18

Now subtract 4 from both sides.

-2x=14

Divide

x=-7

Now check your answer.

-2(-7)+2(2)=18

14+4=18

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4 years ago

Triangle ABC is similar to triangle DEF. The length of

zavuch27 [327]

Answer: $EF=15cm$

Step-by-step explanation:

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3 years ago

Read 2 more answers

Solid metal support poles in the form of right cylinders are made out of metal with a density of 7.3 g/cm^3 3 . This metal can b

sattari [20]

The cost of the metals from the calculations performed is $ 402421.

<h3>What is density?</h3>

Density can be explained as a quantity having mass per unit volume and this can be calculated as:

Mass of the metal = ?

Density of the metal = 7.3 g/cm^3

height of the metal = 610 cm

radius of the metal = 8.7 cm

Volume of a cylinder can be calculated by using the formular below:

$(\pi r^2h )$ And this can be used by inserting the given values which is

$= 3.142 * (8.7)^2 * 610 cm = 145068.97cm^3$

Then we can calculate the mass as :

Mass = (density * volume)

$= (7.3 g/cm3 * 145068cm^3)\\\\=1059003kg$

=Since the cost is $0.38 per kilogram, then 3657 Kg costs

;( 1059003kg * $0.38)

= $ 402421

Learn more about density at: brainly.com/question/1578538

#SPJ1

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