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
erik [133]
3 years ago
12

Is the answer a, b, c, or d.

Mathematics
1 answer:
ale4655 [162]3 years ago
4 0
The correct answer is d.

We have the following system of linear equations:

(I) 4x+7y=-14
(II) 8x+5y=8

Let's use the elimination method, then let's multiply the equation (1) \times(-2) and subtracting (I) and (II):

(I) -2(4x+7y)=-2(-14)
∴ -8x-14y=28

(I) -8x-14y=28
(II) 8x+5y=8
____________________
(III)  -9y=36

∴  y=-4

We can find the value of x by substituting y either in (I) or (II). Thus, from (I):

4x+7(-4)=-14
∴ 4x-28=-14
∴ 4x=14
∴ x=\frac{14}{4}
∴ \boxed{x=\frac{7}{2}}

Let's substitute the values of x and y into (I) and (2)

(I) 4(\frac{7}{2})+7(-4)=14-28=-14
(II) 8(\frac{7}{2})+5(-4)=28-20=8

Finally the answer is:

\boxed{x=\frac{7}{2} \rightarrow x= 3 \frac{1}{2}}

You might be interested in
Someone help me please !!
Phantasy [73]

Answer:

C (1,2)

Step-by-step explanation:

3 0
3 years ago
Rearrange x - y + 1 = 0
Deffense [45]

Answer:

y=x+1

or x=y-1

Step-by-step explanation:

5 0
3 years ago
A container of motor oil is supposed to contain 1000 ml of oil. a quality control engineer is concerned about the variability of
svlad2 [7]

one  hundred millimeters

p.s I am only nine

4 0
3 years ago
Solve the given equation by using the quadratic formula: 2x^2-3x-4=0
kaheart [24]
Let's solve your equation step-by-step.<span><span><span><span>2<span>x2</span></span>−<span>3x</span></span>−4</span>=0</span>Step 1: Use quadratic formula with a=2, b=-3, c=-4.<span>x=<span><span><span>−b</span>±<span>√<span><span>b2</span>−<span><span>4a</span>c</span></span></span></span><span>2a</span></span></span><span>x=<span><span><span>−<span>(<span>−3</span>)</span></span>±<span>√<span><span><span>(<span>−3</span>)</span>2</span>−<span><span>4<span>(2)</span></span><span>(<span>−4</span>)</span></span></span></span></span><span>2<span>(2)</span></span></span></span><span>x=<span><span>3±<span>√41</span></span>4</span></span><span><span>x=<span><span>34</span>+<span><span><span><span>14</span><span>√41</span></span><span> or </span></span>x</span></span></span>=<span><span>34</span>+<span><span><span>−1</span>4</span><span>√<span>41</span></span></span></span></span>
7 0
3 years ago
Read 2 more answers
3<br> Question 7<br> Evaluate<br> if m = -32 and n = 2.<br> +<br> -<br> alo<br> CH OVO
AnnZ [28]
Yes i is the right answer correct right now and she will answer me later when you have time bye bye girl bye bye mama bye bye girl mama mama daddy mama bye mama love you mama bye mama daddy bye bye girl
4 0
3 years ago
Other questions:
  • Estimate the value of √52. Please explain how you use perfect squares to come up with your answer.
    11·1 answer
  • A relay team of 4 people runs 3 miles. If each person runs the same distance, how many mile does each person run?
    7·2 answers
  • John drives at an average speed of 40 miles per hour for the first 5 hours of the 655 mile trip to buffalo. Charlie then drives
    9·1 answer
  • ) 8(-5d - 4z) use z = 7 and d = 8<br> WHAT IS THE ANSWER
    6·1 answer
  • Help please I'll give you brainliest
    11·1 answer
  • Help me baecuase i need help on thios
    7·2 answers
  • 1) What is the area of a circular pizza pie with a diameter<br> of 12 inches?
    7·1 answer
  • Whats 215x18 000000000000000
    15·1 answer
  • A store sells 12 cans of soup for $7.50 How much would it cost to purchase 6 cans of soup? $
    5·2 answers
  • Which statement is true regarding the graphed functions?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!