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
seraphim [82]
2 years ago
7

Solve the following system of equations by Substitution. 5x + 4y = 7 -2x - 2y = 8

Mathematics
2 answers:
kolezko [41]2 years ago
7 0

Answer:

y = 9/13

Step-by-step explanation:

x = -4 + y

5(-4 + y) + 4y = 7

-20 + 9y = 7

9y = -13

mariarad [96]2 years ago
3 0

Answer:

5x + 4y = 7 × -2

-2x - 2y = 8 × 5

-10x - 8y = -14

-10x - 10y = 40

Step-by-step explanation:

2y = -54 ÷2

y = -27

Now substitute the value of y into equation (1)

5x + 4y = 7

5x + 4(-27) = 7

5x = 7 + 108

5x = 115

X = 23

You might be interested in
Which table represents the following equation? y=7n-4?
uysha [10]
There is no attachment to this questions so we do not know which table represents the following. If you re-question, I would be gladly able to do so.
8 0
4 years ago
Plz help me I need your help plz help me plz plz plz help me I’m begging you so much plz help plz plz help me
alexandr1967 [171]

Answer:

B is epic answer

Step-by-step explanation:

8 0
3 years ago
A business buys a computer for $3,000. After 4 years the value of the computer is expected to be $250. The value, v, can be rela
yuradex [85]

You are given two points in the linear function. At time 0 years, the value is $3000. At time 4 years, the value is $250. This means you have points (0, 3000) and (4, 250). You need to find the equation of the line that passes through those two points.

y = mx + b

m = (y2 - y1)/(x2 - x1) = (3000 - 250)/(0 - 4) = 2750/(-4) = -687.5

Use point (0, 3000).

3000 = -687.5(0) + b

b = 3000

The equation is

y = -687.5x + 3000

Since we are using points (t, v) instead of (x, y), we have:

v = -687.5t + 3000

Answer: d. v = -687.50 t + 3,000

6 0
3 years ago
Whats 4.8 as a mixed number in simplest form?
julia-pushkina [17]

Answer:

4 4/5

Step-by-step explanation:

5 0
3 years ago
PLEASE HELP PLEASE I BEG YOU. CHOOSE ALL THE RIGHT ONES
andre [41]

Answer:

a c e g

Step-by-step explanation:

yur welcume

4 0
3 years ago
Other questions:
  • What is the answer to this
    12·2 answers
  • Help me with this problem PLS!!!!!
    7·1 answer
  • LCM of x<sup>2</sup>+5x+6 and x<sup>2</sup>-x-6 is ………………………
    15·1 answer
  • What are the intercepts of this function f(x)=-8x+4
    10·2 answers
  • Which equation represents the line that passes through the point (−2,5) and has a slope of −3?
    5·1 answer
  • In a random sample survey of 240 voters, 128 said they would vote for Candidate A in an upcoming election. 1) Based on the rando
    5·1 answer
  • In ΔABC, the measure of ∠C=90°, the measure of ∠B=64°, and BC= 6.6 Find the length of CA the nearest tenth of a foot
    6·1 answer
  • 5th grade math. correct answer will be marked brainliest.
    10·1 answer
  • Alicia wants to buy a carpet to cover her whole living room, except for the tiled floor. The tiled floor is 6 1/2 ft. by 3 1/4 f
    7·2 answers
  • Old Martha has 5 children, each of whom
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!