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
bixtya [17]
4 years ago
13

2x - 7y = 13 3x + y = 8

Mathematics
1 answer:
Rufina [12.5K]4 years ago
6 0
<span>A) 2x - 7y = 13
B) 3x + y = 8
Multiplying equation B by 7
B) 21x + 7y = 56 then adding it to A
</span><span>A) 2x - 7y = 13
23x = 69
x = 3
y = -1
</span>
You might be interested in
What is the slope of the line described by the equation below
Y_Kistochka [10]
Y-5 = 6x-24    ad 5 to both sides to get y alone
y=6x-19 the slope of the line is 6 and the y-intercept is -19 or (0,-19)
m = 6 or 6/1
3 0
4 years ago
On Monday, Jackie bought 5 1/2 kg of bird seed. She used 2 2/3 on her blue jays and 1/4 for her wrens. How many kilograms of bir
nadya68 [22]

Answer:

4 18/12 - (2 8/12+ 3/12)= 2 7/12

Step-by-step explanation:

First you want to know that you want to subtract the bird seed Jackie got (2 2/3 and 1/4) by the total Jackie bought (5 1/2).

Now set up the equation as 5 1/2 - (2 2/3+ 1/4). Now you need to realize that the fractions are not the same and need to be changed to similar denominators. 2 can be changed to any even denominator so it matters less to what we change it to, so let's focus on the bird seed Jackie used and convert it. 2/3 and 1/4 can be changed into 12's so multiply on the numerator and denominator to get these values. 2/3 would then become 8/12 and 1/4 would become 3/12. 1/2 would then also become 6/12.

Now that we have changed the fractions you want to change the expression to 5 6/12 - (2 8/12+ 3/12). Now add the values in the parentheses to get 5 6/12 - (2 11/12). Now to make this easier add more 12's to 5 6/12 by putting it to 4 18/12. the new equation will be 4 18/12 - 2 11/12, finally subtract from from the same types of numbers: 4-2= 2 18/12-11/12= 7/12. The answer would be 2 7/12.

3 0
4 years ago
a quarterback made 345 pass completions during one football season. if this was 60% of his attempts,how many passes did he attem
steposvetlana [31]

divide completions by percentage

345 / 0.60 = 575 pass attempts

4 0
3 years ago
Read 2 more answers
Check For Understanding
adelina 88 [10]

Answer:

Distance between A ----> B : 2 cm

B ---> C: 3 cm : 600 meters

A----> C: 4 cm

3:600 meters scaled

So its 200 meters per every 1 cm!

From A to B : 400 meters

From B to C : 600 meters

Frok C to A: 800 meters

Therefore we sum 400+600+800= 1800 meters

8 0
3 years ago
HELP QUICK PLEASE!!!!
Simora [160]

Answer:

<em>41.8°, 138.2° and 401.8°</em>

Step-by-step explanation:

Given the expression;

3sin^2x + 4sinx - 4  = 0

Let P = sinx

The expression becomes;

3P²+4P - 4 = 0

Factorize

3P²+6P-2P - 4 = 0

3P(P+2)-2(P+2) = 0

3P-2 = 0 and P+2 = 0

P = 2/3 and -2

When P = 2/3

sinx = 2/3

x = arcsin 2/3

x = arcsin 0.6667

x = 41.8 degrees

Also if P = -2

sinx = -2

x = arcsin (-2)

x will not exist in this case

To get other values of x

sin is positive in the second quadrant

x = 180 - 41.8

x = 138.2°

x = 360+41.8

x = 401.8°

<em>Hence the values of x within the interval are 41.8°, 138.2° and 401.8°</em>

7 0
3 years ago
Other questions:
  • How do you solve 11x=24+8x
    15·1 answer
  • Contains (-3,7) and has a slope of -8/5
    9·1 answer
  • Simplify. Rewrite the expression in the form of 5^n. What is 5^-5\5^8.
    6·2 answers
  • At duckies gas 'n' stuff, gatorade is sold in 4 different sizes as shown below.
    5·1 answer
  • How many ounces are 3 pounds ?
    13·2 answers
  • 2log7-2r=0 with the 7 being a subscript(small)
    14·1 answer
  • Plz help. I’m trying but I can’t. Figure this one out. Mainly because the equations aren’t lined up accordingly with the variabl
    10·1 answer
  • Don went to his favorite restaurant and ordered a meal. His bill came out to $15.77. He wants to pay a 15% tip. How much did he
    12·1 answer
  • Flip both coins 50 times and record your data in a table like the one below.
    7·2 answers
  • Determine the value of x. Round answer to the nearest hundredth.
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!