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egoroff_w [7]
3 years ago
15

Which is the best first step when solving the following system of equations? x + y = 3. 4 x minus y = 7. Multiply the first equa

tion by 4. Add the first equation to the second equation. Multiply the second equation by Negative 1. Subtract the second equation from the first equation.
Mathematics
2 answers:
Gala2k [10]3 years ago
8 0

Answer:

The other guy is wrong its c

Step-by-step explanation:

Kryger [21]3 years ago
6 0

Answer:

Multiply the first equation by 4.

Step-by-step explanation:

4(x+y=3) which gives

4x+4y=12

and

4x-y=7

Then subtract the two equations and the x variable will be eliminated.

You might be interested in
Flying against the wind, a jet travels 2190 miles in 3 hours. Flying with the wind, the same jet travels 9520 miles in 8 hours.
dezoksy [38]

Answer:

Velocity of jet in still air is 970 miles per hour and velocity of wind is 210 miles per hour.

Step-by-step explanation:

Jet's velocity against wind is

3040/4 = 760 miles per hour and flying with wind it is

8260/7 = 1180 miles per hour.

Let the velocity of jet in still air be x miles per hour and velocity of wind be y miles per hour.

As such its velocity against wind is x − y and with wind is x + y and therefore

x − y = 760 and x + y = 1180

Adding the two 2 x = 1940 and x = 970 and y = 1180 − 970 = 210

Hence velocity of jet in still air is 970 miles per hour and velocity of wind is

210 miles per hour.

Actual Answer:

https://socratic.org/questions/flying-against-the-wind-a-jet-travels-3040-miles-in-4-hours-flying-with-the-wind

7 0
3 years ago
There are 450 students at a school. If each classroom holds 30 students , how many classrooms are needed at school?
Sati [7]

Answer:

15 classrooms

Step-by-step explanation:

3 0
3 years ago
What is one extensive and one intensive property of marker ink?
Y_Kistochka [10]
One extensive property of marker ink is volume, whereas one intensive property of marker ink is color. 
3 0
3 years ago
Consider the expression 20-(4^2/2). How many terms does the expression have?
natali 33 [55]

Answer:

huh

Step-by-step explanation:

7 0
2 years ago
Zeke is making posters for the school play. He borrows 12 bottles of paint from the art teacher. Each bottle has 300 milliliters
solong [7]

Answer:

4 liters

Step-by-step explanation:

300 × 12 = 3600 ml

3600 + 400 = 4000 ml

1 liters = 1000 ml

liters to milliliters need to × 1000

milliliters to liters need to ÷ 1000

4000 ÷ 1000 = 4 liters

4 0
1 year ago
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