3 years ago

What is the value of x and y if 21x+7y=42 and -5x+5y=10 are equal

Mathematics

1 answer:

nikdorinn [45]3 years ago

7 0

Answer:

-5x/5 +5y/5=10/5=2

y-x=2

y=x+2

21x+7*(x+2)=42

21x+7x+14=42

28x=42-14

28x=28

x=1

y=1+2

y=3

Step-by-step explanation:

You might be interested in

ASAP! GIVING BRAINLIEST! Please read the question THEN answer correctly! No guessing. Show your work or give an explaination.

Rzqust [24]

Answer:

B. $f(x)=-(x-4)^{2} -3$

Step-by-step explanation:

$f(x)=x^{2}$

The transformations are:

Reflected upon the x axis (x is now negative):

$f(x)=-x^{2}$

Moved 4 units to the right (instead of just the variable x, you have (x-4)):

$f(x)=-(x-4)^{2}$

And finally moved 3 units down (so now it's minus 3):

$f(x)=-(x-4)^{2} -3$

Hope this helps! :]

8 0

4 years ago

At Daniel's Swimwear, there are 76 bikini styles and 4 other types of swimsuit. What percentage of the swimsuit styles are bikin

Alborosie

Total swimwear = 76 bikinis + 4 other types = 80 total

divide number of bikinis by total swimwear then multiply by 100:

76/80 = 0.95

0.95 x 100 = 95%

Answer: 95% are bikinis

3 0

2 years ago

Can someone help me ASAP

Crank

Answer:

Step-by-step explanation:

6 0

3 years ago

Read 2 more answers

Evaluate angles s and r, giving reason for your answer

vovikov84 [41]

Answer:

r=42 degrees

This is because of vertically opposite angles

s=68

This is because 180( angles in a triangle) minus ( 70 + 42) is equal to 68 degrees

3 0

3 years ago

Read 2 more answers

Find the solution to the system of equations

Zinaida [17]

Answer:

(-1, 1)

Step-by-step explanation:

Just look at where the two lines intersect and thats the soloution

6 0

3 years ago