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
weqwewe [10]
3 years ago
8

A student solved a system of equations by elimination. Describe and correct the error made in the part of the solution shown.

Mathematics
1 answer:
ivanzaharov [21]3 years ago
7 0

Answer:

x = -2; y = 3

Step-by-step explanation:

5x + 4y = 2 (1)

3x + 3y = 3 (2)

Multiply (1) by 3 and (2) by 4

15x + 12y = 6 (3)

12x + 12y = 12 (4)

Subtract (4) from (3)

15x - 12x = 6 - 12

3x = -6

x = -6/3

x = -2

Substitute x = -2 into (1)

5x + 4y = 2

5(-2) + 4y = 2

-10 + 4y = 2

4y = 2 +10

4y = 12

y = 12/4

y = 3

The first error is when he multiplied equation (2) by 4

He didn't multiply the right hand side of the equation by 4

3x + 3y = 3 ×4

12x + 12y = 12

But he wrote

12x + 12y = 3

The the next error is subtracting the left hand side of the equation and adding the right hand side

15x + 12y = 6

12x + 12y = 3

He wrote

3x = 9

Instead of 3x = 3

You might be interested in
A scatterplot is used to display data for a runner where x is the number of miles run, and y is the time, in minutes, that it ta
Effectus [21]

Answer:

Answer: A the member can tolerate a temp of 173 fahrenheit for 0 minutes

Step-by-step explanation:

6 0
3 years ago
Consider the equation<br> 2 5<br> x 2X-1<br> Solve for x.
rjkz [21]
The answer would be 49
8 0
3 years ago
Please help. I do not understand. Thank you!
nasty-shy [4]

y/x so -3/5 = y/-1

...cross multiply

3 = 5y

...divide by 5

3/5 = y

8 0
3 years ago
Find x and y intercepts
Airida [17]
If its on a graph just look for the spot where the line meets the y and x-axis 
6 0
3 years ago
The Snow Sports Club from Sierra High School is boarding the tram at Heavenly Valley to ride up to the top of the mountain. The
hoa [83]
17 people and 9 snowboards.
4 0
3 years ago
Read 2 more answers
Other questions:
  • M is the midpoint of CF for the point c(3, 4) and f (9, 8) find MG
    11·1 answer
  • Anyone wanna help a girl out w some pre-cal? The range &amp; one to one function is hard for me w this graph. I don’t understand
    10·1 answer
  • A student has gotten the following grades on his tests. What is the minimum grade he must get on the last test in order to have
    8·2 answers
  • Keith ran in a marathon. itt took him 3 hours and 2 minutes to run 26 miles. If he ran at the same rate for the whole race , how
    10·1 answer
  • Between the pair of numbers insert the proper sign 4.67 4.6 07
    5·1 answer
  • Of the 24 students in Greg’s class,3/8 ride the bus to school. How, many students ride the bus?
    6·2 answers
  • Find the slope of a line perpendicular to 3x+y=15 ,-1/3, 5, -3, 1/3
    12·1 answer
  • Budget planners in two towns, Alphaville and Betaville, developed models to determine the budget surplus (in dollars) for a year
    6·1 answer
  • 1 po
    13·1 answer
  • Find the unit vector in the direction of (-2, -1).
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!