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Jobisdone [24]
3 years ago
5

12) -7x + y=-19 -2x + 3y =-19 Solve by elimination

Mathematics
1 answer:
asambeis [7]3 years ago
5 0

X = 2

Y = -5

Step-by-step explanation:

We will multiply -7x + y=-19 by 3 so we can make the ys identical with the second equation. This way, its easier to eliminate them;

3(-7x + y=-19) =

-21x + 3y = -57

Then we can eliminate the ys by elimination. Be keen with the sign before each value;

-21x + 3y = -57

-

-2x + 3y =-19

=

-19x = - 38

X = -38 / -19

X = 2

We can substitute the value of x in one equation get the value of y;

-7(2) + y = -19

-14 + y = -19

Y = -19 +14

Y = -5

Learn More:

For more on solving equations by elimination check out;

brainly.com/question/11155931

#LearnWithBrainly

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Ivenika [448]
We first calculate the area of the entire pool and the side walk.

Given that the pool has a diameter of 60 feet and that the side walk surrounds the pool with a width of 5 feet. This means that the diameter of the entire pool and the side walk is 60 + 5 + 5 = 70 feet and the radius is 70 / 2 = 35 feet

Thus the area of the entire pool and the side walk is obtained as follows:

Area=\pi r^2 \\  \\ =\pi(35)^2=1,225\pi\ square\ feet

Given that the pool has a diameter of 60 feet, this means that the radius of the pool is 30 feet.

Thus the area of the pool is given by:

Area_{pool}=\pi r^2 \\  \\ =\pi(30)^2=900\pi\ square\ feet

Therefore, the area of the sidewark is the area of the entire pool and side walk minus the area of the pool, this is given by:

Area_{side walk}=1,225\pi-900\pi \\ \\ =325\pi=1,021 \ square\ feet.
6 0
3 years ago
Why is it that a unit rate has a denominator of one?
slava [35]
A rate that has a denominator of 1 unit is called as Unit rate.
3 0
3 years ago
Pleaseee help, i know for sure it’s not 275
Alex777 [14]

Answer:

b, 300

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6 0
3 years ago
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