1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
kogti [31]
3 years ago
8

Which of the following equations shows how substitution can be used to solve the following system of equations?

Mathematics
1 answer:
igor_vitrenko [27]3 years ago
4 0

Answer:

(3, 5)

Step-by-step explanation:

y = 2x - 1

3x + 2y = 19

In the second equation, substitute 2x - 1 in for y, since y equals 2x - 1 in the first equation. Solve for x.

3x + 2(2x - 1) = 19

3x + 4x - 2 = 19

7x - 2 = 19

7x - 2 + 2 = 19 + 2

7x = 21

7x/7 = 21/7

x = 3

Pick the first equation to solve for y since it says y =. Substitute 3 in for x.

y = 2x - 1

y = 2(3) - 1

y = 6 - 1

y = 5

You might be interested in
Alguien me podría ayudar
BaLLatris [955]

Answer:

yessir

Step-by-step explanation:

7 0
3 years ago
Can someone pls answer all 6 questions pls? Pretty pls, except 1 and 5 thank you so much!!!
Maksim231197 [3]
2) C
3) B
4) C
6) I'm pretty sure its D but it could be C
7 0
3 years ago
Read 2 more answers
<img src="https://tex.z-dn.net/?f=the%20%5C%3A%20angle%20%5C%3A%20of%20%5C%3A%20measure%20%5C%3A%20%20%5Cfrac%7B31%5Cpi%7D%7B6%7
Yakvenalex [24]

Answer:

3rd quadrant

Step-by-step explanation:

  • First we just convert the angle from radians to degrees
  • \frac{31\pi radians }{6}*\frac{180degrees}{\pi radians}  =\frac{31*180}{6} degrees=930degrees
  • Now that's too big, all this means is if we start rotating from the positive y-axis in a circle we will cross the starting point 2 times, 2 full circles;
  • 930degrees-360degrees=570degrees\\570degrees-360degrees=210degrees  
  • Now in which quadrant it 210 degrees?
  • 0 degrees to 90 degrees is 1st quadrant
  • 90 degrees to 180 degrees is 2nd quadrant
  • 180 degrees to 270 degrees is 3rd quadrant
  • 270 degrees to 360 degrees is 4th quadrant
  • So our answer is the 3rd quadrant.
7 0
2 years ago
Michael jogs at 3 miles per hour and Jack runs at 4.5 miles per hour. If Michael starts at 2:00 pm and Jack starts on the same c
tresset_1 [31]

Answer:

It will take Jack 40 minutes to cover the same distance which Micheal covers in 60 minutes. Both will meet at 3 miles distance at 3 pm.

Step-by-step explanation:

Micheal  runs 3 miles in one hour or 60 minutes.

In one minute he runs 3/60= 1/20  or 0.05miles.

Jack runs 4.5 miles in one hour or 60 minutes.

In one minute he runs 4.5/60= 45/600= 9/120= 3/40  or 0.075 miles.

So Jack is 0.075/0.05 = 1.5 times faster than Micheal.

or Micheal is 1.5 times slower than Jack.

Jack starts from 2:20 pm and at 3 pm he will run 0.075(40 minutes)= 3miles

Micheal start at 2:00 pm and at 3 pm he will run 0.05(60 minutes)= 3 miles

So at 3 pm both will have covered equal distance= 3miles.

It will take Jack 40 minutes to cover the same distance which Micheal covers in 60 minutes. Both will meet at 3 miles distance at 3 pm.

3 0
3 years ago
If the rate of a person walking is 2.4 miles in 10 minutes. How far can he walk in 90 minutes hours?
Gre4nikov [31]

Answer:

21.6

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
Other questions:
  • What number would you add to both sides of x2 + 7x = 4 to complete the square? 22 72
    8·2 answers
  • A deposit of 8000 at 9.5% for 120 days
    10·1 answer
  • A Mountain road rises 30 feet for a 490-foot run. What is it’s slope
    9·1 answer
  • The gross federal debt y​ (in trillions of​ dollars) for a certain country in year x is approximated by the following​ equation,
    10·1 answer
  • What is the decimal equivalent of each rational number
    13·1 answer
  • Caitlin drew a scale drawing of the community park in her town. The actual
    6·1 answer
  • juan drove 126 miles in 3 hours. If he continued at the same rate, how long would it take to travel 336 miles? ​
    8·2 answers
  • A concession stand charges $2.50 for a bag of popcorn. The stand has already sold 30 bags of popcorn. How many more bags x of po
    9·1 answer
  • What is the value of 5/6 divided by 3/4 in a fraction form
    7·2 answers
  • 8 stones and 2 pounds − 4 stones and 2 pounds
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!