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elena-14-01-66 [18.8K]
3 years ago
7

What is the x value for 21x+7y=42

Mathematics
2 answers:
xz_007 [3.2K]3 years ago
6 0

Step-by-step explanation: The letter "x" is often used in algebra to mean a value that is not yet known. It is called a "variable" or sometimes an "unknown". In x + 2 = 7, x is a variable, but we can work out its value if we try!

Andreyy893 years ago
5 0
The value of X is 1.66 repeated ?
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(32 + 9 − 1) + (−52 + 6 − 10)
egoroff_w [7]

Answer:

-16

Step-by-step explanation:

(32+9-1)+(-52+6-10) \\ \\ =(41-1)+(-46-10) \\ \\ =40-56 \\ \\ =-16

3 0
1 year ago
Read 2 more answers
What was the original price if: after increasing by 60% it became $8a?
Morgarella [4.7K]
I think it’s 5......I think
3 0
3 years ago
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PLEASE HELP! IM ALMOST DONE WITH THIS ASSIGNMENT PLSSS HELPP ILL GIVE BRAINLIEST SHOW UR WORK
Talja [164]

Answer:

x = -3

y = -8

Step-by-step explanation:

2y = x - 13

3x = y - 1;  let y = 3x + 1

substitute to solve for 'x':

2(3x + 1) = x - 13

6x + 2 = x - 13

5x + 2 = -13

5x = -15

x = -3

solve for 'y':

3(-3) = y - 1

-9 = y - 1

-8 = y

7 0
3 years ago
Read 2 more answers
System of equations<br><br>y=1/2x +5<br>y=3x -5​
Art [367]

Answer: 4

Step-by-step explanation:

Set them equal to each other since they're both equal to y

3x-5=.5x +5

add 5 to both sides

3x=.5x+10

subtract .5x from both sides

2.5x=10

divide both sides by 2.5

x= 4

5 0
3 years ago
The length of a rectangle is 11 units more than its width. The perimeter of the rectangle is 182 units. Solve for the dimensions
alekssr [168]

Answer:

2160 units square

Step-by-step explanation:

We are given the perimeter of 182 units and that the lengths are 11 more units than the width. So the length is W+11, eleven more than the width. There is also 2 width sides so the sum of the lengths are 2W+22. There is also 2 width sides so if you add that to the equation the perimeter equals 4W+22.

4W+22=182

4W=160

W=40

So the width is 40 units, and the length is 11 more so the length is 54 units. Multiply these two numbers to get the area. 44*54=2160 square units.

3 0
3 years ago
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