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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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Determine whether each pair of ratios are equivalent ratios. Write yes or no.
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Bob wants to buy a pack of pens that costs $4.95. He has 2 dollar bills, 5 quarters, and two dimes. How much more money does he
Simora [160]

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Bob needs $1.50 to buy the pack of pens

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How many tons of cheese will 20,850,000 Texans consume this year?
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3 years ago
Jake’s map shows the distance from the Bake Stars Cafe to the restaurant supply store as 3 centimeters. If the scale of the map
Olegator [25]

Answer:

x = 24 km

Step-by-step explanation:

Given:

- Distance from Cafe to store on map d' = 3 cm

- The scale of map = 1 cm : 8 km

Find:

what is the real distance from the shop to the store?

Solution:

- We can use direct proportions to evaluate the actual distance from Cafe to the store as follows:

                              1 cm --------------> 8 km

                              3 cm --------------> x

- The actual distance x is as follows:

                              x = 8 km * 3 cm / 1 cm

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8 0
3 years ago
You are preparing to paint a grain silo. The silo is a 20-foot tall cylinder with a circumference of 147 feet. One gallon of pai
Over [174]

Answer:

The answer to your question is 9 gallons

Step-by-step explanation:

Data

height = 20 ft

perimeter = 147 ft

1 gallon covers 300 ft²

paint = ?

Formula

Area of a cylinder = 2πrh + πr²

2πr = 147 ft

r = ?

Process

1.- Calculate the radius

             2πr = 147

                 r = 147/2π

                 r = 23.4 ft

2.- Substitution

Area of the cylinder = 147(20) + 3.14(23.4)²

3.- Simplification

Area of the cylinder = 940 + 1719.33

Area of the cylinder = 2659. 33 ft²

4.- Divide the area of the cylinder by the area a gallon can cover.

Number of gallons = 2659.33/300

                               = 8.86 ≈ 9                                    

3 0
3 years ago
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