All categories

4 years ago

Can some one help how to work out this problem x-y=11 2x+y=19solve by substitution

1 answer:

4 0

$x-y=11 \\
2x+y=19 \\ \\
\hbox{solve the 1st equation for x:} \\
x-y=11 \\
x=11+y \\ \\
\hbox{substitute 11+y for x in the 2nd equation:} \\
2(11+y)+y=19 \\
22+2y+y=19 \\
22+3y=19 \ \ \ |-22 \\
3y=-3 \ \ \ |\div 3 \\
y=-1 \\ \\ x=11+y=11-1=10 \\ \\
(x,y)=(10,-1)$

You might be interested in

.......................

sergey [27]

Answer:

Step-by-step explanation:

5 0

3 years ago

Round off to the nearest hour 10 :54

Pachacha [2.7K]

Answer:

Step-by-step explanation:

the closest whole number on the hour is 11

5 0

3 years ago

Please help with 1 and 2 :)

nordsb [41]

Answer:

1. The domain for the number of fruit cups is 0 minimum and 20 maximum.

[0 < x < 20].

2. [10 < y < 70]

Step-by-step explanation:

1. The domain is 0 to 20 because there are 20 people total who will each have a fruit cup

2. The range is $10 to $70 because the minimum price is $10 without any fruit cups and $70 when there are 20 fruit cups.

4 0

3 years ago

A tissue can be 0.000075 meters thick.

Setler [38]

Answer:

The required expression is $7.5\times 10^5$

Step-by-step explanation:

Consider the provided information.

A tissue can be 0.000075 meters thick and we need to represent it into scientific notation.

Steps to write a number in scientific notation.

Move the decimal place to the right so that the new number from 1 up to 10.

Determine the exponent, the exponent is the number of times you moved the decimal.

Now, consider the number 0.000075

Move the decimal point to 5 place right so that the new number from 1 up to 10.

Now, put the exponent the number of times you moved decimal. $7.5\times 10^5$

Hence, the required expression is $7.5\times 10^5$

5 0

4 years ago

Which of the following statements is true regarding the relationship between circles and triangles? A. There are many circles th

max2010maxim [7]

Its worth trying drawing circles and triangles to find the correct one.

If you do you'll find that the answer is B.

5 0

3 years ago

Read 2 more answers