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borishaifa [10]
4 years ago
14

Solve the system by elimination 2x+7y=1 2x-4y=12

Mathematics
2 answers:
PSYCHO15rus [73]4 years ago
8 0

Answer:

x = 4 y= -1

Step-by-step explanation:

Solve the system by elimination by stacking the equations lining up the variables.

2x + 7y = 1

2x - 4y = 12

Next, subtract each of the like terms.

  2x + 7y = 1

-  2x - 4y = 12

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

   0x +11y = -11

            y = -1

Then substitute y = -1 into one of the equations.

2x + 7(-1) = 1

2x - 7 = 1

2x = 8

]x = 4

konstantin123 [22]4 years ago
7 0

Answer:

y=-1, x=4

Step-by-step explanation:

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2(x + 4) = 4x + 3 - 2x + 5
Lera25 [3.4K]

Answer:

0 true for all values

Step-by-step explanation:

3 0
3 years ago
What is the y-value of the vertex 4x^2 +8x-8
galina1969 [7]

Answer:

-12

Step-by-step explanation:

Here the coefficients a, b and c are 4, 8 and -8 respectively.

                                                                     -b

A formula for the axis of symmetry is x = -------

                                                                      2a

                                 -8

... which yields x = --------- = -1

                                2(4)

Evaluating f(x) = 4x^2 + 8x - 8 at x = -1 yields   f(-1) = 4(-1)^2 + 8(-1) - 8 = -12.

The y-value of the vertex is -12.  Note that the vertex lies right smack on the axis of symmetry.

7 0
4 years ago
What is the value of x ? When a triangle side B is 75° SIDE C is 50° and sideA is X
chubhunter [2.5K]

Answer:

55°

Step-by-step explanation:

Assuming you are looking for the angles and not the length of the sides, the remaining angle is 55°. All 3 angles have to equal 180°.

A+B+C=180

A+75+50=180

Subtract 75 and 50 from 180 to get:

A=55

3 0
4 years ago
The vertices of a rectangle are R(–5, –5), S(–1, –5), T(–1, 1), and U(–5, 1). After translation, R' is the point (–11, –11). Fin
koban [17]

Answer:

The original coordinate of

R is (-5, -5)

The new coordinate of

R is (-11, -11)

The translation rule is ( x - 6, y - 6)

The original coordinate of

U is (-5, 1)

The new coordinate of

U is (-5 - 6, 1 - 6)

which is

(-11, -5)

U' = (-11, -5)

7 0
3 years ago
PLZ ANSWER <br><br> 1-2x = -X-3
DIA [1.3K]

Answer:

-4=x

Step-by-step explanation:

1) 1-2x=-x-3 (letter's to the left)

2) then you get 1-x=-3

3) then you subtract 1 on both sides

4) then you dived the -1

5)answer -4=x

5 0
3 years ago
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