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andrew11 [14]
3 years ago
10

Need Help Please!!!!!

Mathematics
1 answer:
SVEN [57.7K]3 years ago
3 0

-1 2+× and follow me plz send

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7x + 6y = -1 ; -x + 2y = 3 with elimination
Harlamova29_29 [7]

Answer:

x= -1, y=1

Step-by-step explanation:

First label the 2 equations.

7x +6y= -1 -----(1)

-x +2y= 3 -----(2)

Then choose which term you would like to eliminate. To eliminate the y term, multiply equation (2) by 3 such that the coefficient of y is 6.

(2) ×3:

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

Since the coefficient of y is positive 6 in both equations, subtract one equation from the other.

(3) -(1):

-3x +6y -(7x +6y)= 9 -(-1)

Expand:

-3x +6y -7x -6y= 9 +1

-10x= 10

x= 10 ÷(-10)

x= -1

Substitute x= -1 into (2):

-(-1) +2y= 3

1 +2y= 3

2y= 3 -1

2y= 2

y= 2 ÷2

y= 1

------------------------------------------------------------

2nd method: eliminating the x term

(2) ×7:

-7x +14y= 21 -----(3)

Since the coefficient of y in equation (1) is a positive 7, while that in equation (3) is a negative 7, add the 2 equations together to eliminate the x term.

(1) +(3):

7x +6y -7x +14y= -1 +21

20y= 20

y= 20 ÷20

y= 1

Substitute y= 1 into (2):

-x +2(1)= 3

-x +2= 3

-x= 3 -2

-x= 1

x= -1

5 0
3 years ago
Is 4/5 greater or less than 6/7
Stolb23 [73]

Answer:

4/5 < 6/7

Step-by-step explanation:

first we need to equalize the denominator so we can compare them

4/5 Ο 6/7

28/35 Ο 30/35

28/35 < 30/35

so

4/5 < 6/7

7 0
3 years ago
Which of the following whole numbers is even?
pickupchik [31]
The answer is B. 936
8 0
3 years ago
Read 2 more answers
There is a silk shirt for $95 there is a 25% discount what is the discount
kondaur [170]

Step-by-step explanation:

95-25=70 hoped this helped

3 0
3 years ago
Read 2 more answers
If $-2 &lt; x \le 3,$ then find all possible values of $5x + 1.$ Give your answer in interval notation.
kotegsom [21]

Answer: (-9, 16]

This is the interval from -9 to 16. Exclude -9 but include 16.

=====================================================

Work Shown:

The idea is to multiply all sides by 5, then add 1 to all sides

-2 < x \le 3

5(-2) < 5x \le 5(3)

-10 < 5x \le 15

-10+1 < 5x+1 \le 15+1

-9 < 5x+1 \le 16

This converts to the interval notation  (-9, 16]

note: a curved parenthesis means "do not include this value in the solution set"; while a square bracket has us include the value. So we exclude -9 and include 16.

3 0
3 years ago
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