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Arada [10]
3 years ago
12

Tina wrote the equations 3x - y = 9 and 4x + y + 5, What can Tina conclude about the solution to this system of equations?

Mathematics
2 answers:
Maru [420]3 years ago
4 0
3x - y = 9
4x + y = 5
---------------add
7x = 14
x = 14/7
x = 2

3x - y = 9
3(2) - y = 9
6 - y = 9
-y = 9 - 6
-y = 3
y = -3

C. (2,-3) is a solution to the system of linear equations
Dmitriy789 [7]3 years ago
3 0

Answer:

C. (2, –3) is a solution to the system of linear equations.

Step-by-step explanation:

Given equations are,

3x - y = 9 --------(1),

4x + y = 5 --------(2),

Equation (1) + Equation (2),

3x + 4x = 9 + 5

7x = 14           ( Combine like terms )

x = 2             ( Divide both sides by 7 ),

From equation (1),

3(2) - y = 9

6 - y = 9

-y = 9 - 6    ( Subtraction 6 on both sides )

-y = 3

⇒ y = - 3     ( Multiplying -1 on both sides )

Hence, the solution of the system of equations is (2,-3),

Option 'C' is correct.

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its C

Step-by-step explanation:

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2 years ago
Of the 8760 hours in a year, most televisions are on for 2190 hours. What percent is this
Dimas [21]

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Hello!! Your answer is 25% I think!

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7 0
2 years ago
Find the area of the shaded region in the figure below. 5in. 8in.
Fiesta28 [93]

Hi there!

<u>Answer:</u>

The area of the shaded region is 28 in²


<u>Step-by-step explanation:</u>

You will have to do 3 different steps in order to find the area of the shaded region.

First, you will need to find the total area of the rectangle using the values you have and the area formula for a rectangle, which is : A = Length × Width

"A" is the area, which is what we are looking for

The "Length" is equal here to 8 inches

The "Width" is equal here to 5 inches


A = <u>8 × 5</u>

A = 40 in²


Now that you have the area of the rectanlge, your second step is to find the area of the triangle using the values you have and the area formula for a triangle, which is : A = (Base × Height) ÷ 2

"A" is the area, which is what we are looking for

The "Base" is equal here to 8 inches

The "Height" is equal here to 3 inches


A = <u>(8 × 3)</u> ÷ 2

A = <u>24 ÷ 2</u>

A = 12 in²


Now that you have both the area of the rectangle and the area of the triangle, all you have to do for your third and final step is subtract the area of the triangle from the area of the rectangle so that you are left with the area of the shaded region :

Area shaded region = <u>40 in² - 12 in²</u>

Area shaded region = 28 in²


There you go! I really hope this helped, if there's anything just let me know! :)

6 0
3 years ago
On Monday, the high was 60oF. On Tuesday, the high was 10% more than Monday. Then on Wednesday, the temperature decrease by 8%.
Arada [10]

Answer:

60.72

Step-by-step explanation:

Monday: 60 degrees

Tuesday: temperature increases by 10 percent

60 + 10% of 60

60 + .10*60 = 70 +6 = 66

Wednesday: temperature decreases by 8 percent

66 - 8%of 66

66 - .08*66 = 66 -5.28=60.72

7 0
3 years ago
Read 2 more answers
40-10 written as an algebraic Expression
sukhopar [10]
40 - 10 = x

This is because

Numeric expressions apply operations to numbers. For example, 2(3 + 8) is a numeric expression. Algebraic expressions include at least one variable and at least one operation (addition, subtraction, multiplication, division). For example, 2(x + 8y) is an algebraic expression.


https://www.brainfuse.com/jsp/alc/resource.jsp?s=gre&c=35234&cc=108822
7 0
3 years ago
Read 2 more answers
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