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
Lana71 [14]
3 years ago
5

2x+5y=20. , -2x+20y=-90. one solution. infinity many ir no solution. use elimination to find your answer​

Mathematics
1 answer:
scoundrel [369]3 years ago
5 0
2x+5y=20
X=10-2.5y

-2(10-2.5y)+20y=-90
-20+5y+20y=-90
25y=-70
Y=2.8

2(2.8)+5y=20

5.6+5y=20
5y=14.4
Y=2.88

CHECK:
2(2.8)+5(2.88)=20

You might be interested in
Determine if the statement is true or false<br> The figures below are similar
artcher [175]

Answer:

True

Step-by-step explanation:

The polygons given have 5 sides, so the sum of their interior angles is (5-2) * 180 = 540. Next, there are 4 pairs of corresponding sides. Writing those sides as a, b, c, and d, for each pentagon, we can write

540 = a + b + c + d + missing angle

540 = a + b + c + d + missing angle

As is shown here, if a, b, c, and d are the same, 540 - (a+b+c+d) = missing angle is the same as well. Therefore, there are 5 corresponding angle pairs for the two polygons. Furthermore, because there are only 5 angles for each polygon, and because having all corresponding angles be equal makes polygons similar to each other, the polygons given are similar

7 0
3 years ago
What type of money has value based on intrinsic worth?
Svetradugi [14.3K]

Answer: Commodity money

Explanation: has intrinsic value because it has other uses besides being a medium of exchange. Fiat money serves only as a medium of exchange, because its use as such is authorized by the government; it has no intrinsic value.

7 0
1 year ago
Natalia sawed five boards of equal links to make a school each was 9/10 of a meter long what is the total length of the board sh
Alexxandr [17]
5×9/10=4.5
        9/10          1 8/10         2 7/10        3 6/10             4 5/10
---------------l--------------l---------------l----------------l----------------
5 5/10=4 1/2=4.5
6 0
3 years ago
Helpppppppppppp!!!!!!!!!!!!! 20 Pointssssssssssssss!!!
son4ous [18]

Answer:

115

Step-by-step explanation:

because 6 & 7 will add up to 180

so if 7 = 65

then 180 - 65 = 115

#6 = 115

5 0
2 years ago
Read 2 more answers
A home store donated a percent of everybody sale to charity. The total sales were $6,550 so the store donated $393. What percent
Andrej [43]

Answer:

6%

Step-by-step explanation:

393/6550=0.06

0.06=6%

5 0
3 years ago
Other questions:
  • Can anyone help??? I’m stuck
    9·2 answers
  • Find the scale factor of the dilation. Then tell whether it is enlargement or reduction.​
    5·1 answer
  • you earn $420 per week. You pay social security taxes of 7.65% federal taxes of 22%, and state taxes of 5.95%. What is your take
    7·1 answer
  • 1. Graph the system of inequalities.
    14·1 answer
  • A number, x, rounded to 2 decimal places is 15.38<br>Write down the error interval for x.​
    5·1 answer
  • What is the probability that she draws a card less than 5
    8·2 answers
  • The graph shows a function.<br> Find the value of b and d.
    8·1 answer
  • An ordered pair is
    6·1 answer
  • -8 &lt; x/4 <br> I need the answer ASAP
    10·1 answer
  • Help please, its due soon !<br><br><img src="https://tex.z-dn.net/?f=%20%7Bx%7D%5E%7B2%7D%20%20%2B%206x%20%2B%209" id="TexFormul
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!