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vredina [299]
3 years ago
12

Х - Зу = 72х - бу = 12need help.solving systems by elimination.​

Mathematics
1 answer:
Zanzabum3 years ago
6 0

{x - 3y = 7              | · (-2)

{2x - 6y = 12

{-2x + 6y = -14

{2x - 6y = 12                    (+)

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

-2x + 2x + 6y + (-6y) = -14 + 12

0 = -2

contradiction

x, y ∈ ∅

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Plz answer correctly both questions if do will give brainliest!!!!
Marina86 [1]
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6 0
3 years ago
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Let the function f(x) have the form f(x) = Acos(x-C). To produce a graph that
Gala2k [10]

Answer:

A has to be 2

Step-by-step explanation:

In the expression f(x)=A*cos(x-C), the multiplicative factor A represents what is called the "amplitude of the wave-shaped function that you obtain as the graph. Such amplitude is understood as half of the crest-to-through distance of the wavy curve.

From the drawing, the crest is at y=2 and the through at y=-2 (a distance of 4 units) therefore the value of A should be half of that distance: 4/2 = 2

6 0
3 years ago
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20.
Alik [6]

Answer:

After 3 seconds

Step-by-step explanation:

Given

h(t) = -16t^2 + 96t

Required

Seconds to attain maximum height

The maximum of a quadratic function y = ax^2 + bx + c is calculated using:

x = -\frac{b}{2a}

So, we have:

t = -\frac{b}{2a}

Where:

a = -16 and b = 96

So:

t = -\frac{96}{2 * -16}

t = -\frac{96}{-32}

Cancel out negatives

t = \frac{96}{32}

t = 3

5 0
2 years ago
Which of these is the algebraic expression for "3 times the sum of 2 and y?"
max2010maxim [7]

Answer:

the answer is 3(2+y)

Step-by-step explanation:

i commented that first it would not let me answer

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7 0
3 years ago
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How can you tell that a system of linear equations will have infinitely many solutions without computation?
Contact [7]

If you can manipulate the two equations so that they have exactly the same coefficients (e. g., 3x + 4y = 8 and 2x + 4y = 8), then you conclude that the two lines coincide (overlap), and that there are thus infinitely many solutions.

3 0
3 years ago
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