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Feliz [49]
3 years ago
11

3x+y=15 3x-y=15 (using elimination method)

Mathematics
2 answers:
morpeh [17]3 years ago
5 0

Answer:

x = 5

y = 0

Step-by-step explanation:

3x + y = 15

3x -y = 15

Add the two equations;

6x = 30

Inverse operations;

6x = 30

/6        /6

x = 5

Back substitute;

3(5) + y = 15

15 + y = 15

y = 0

Yanka [14]3 years ago
4 0

Answer:

Step-by-step explanation:

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Which value of c makes the polynomial below a perfect square
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3 years ago
Anyone know #3 for me I’m stuck
steposvetlana [31]
<h3>Answers:  4,  3,  2</h3>

Each number gets its own box, and the values are entered in that exact order.

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

Explanation:

x and y are placeholders for numbers.

If we replace x with -1, then we get

y = -x+3

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y = -(-1)+3 ... replace x with -1

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This means that x = -1 leads to y = 4. So we'll write 4 underneath the "-1" in the y row.

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

Similarly, if x = 0, then

y = -x+3

y = -0+3

y = 0+3

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Leading to 3 being the next item we input.

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

Finally, if x = 1, we get this y value

y = -x+3

y = -1+3

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Which is the last value in the bottom row.

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

The order of the y values in the bottom row is therefore: 4,  3,  2

This means the points (-1, 4), (0, 3), and (1, 2) are on the line y = -x+3.

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5 0
3 years ago
Zachary says that the equation 0 =-1/2 (x – 4)(x –
melomori [17]
<u><em>Answer:</em></u>
c = 4

<u><em>Explanation:</em></u>
The number of solutions for any equation is equal to the degree of the equation.

The given equation is a second degree equation which means that it has two solutions.

The only possible way for it to have one unique real solution is that the two <u>solutions are equal</u>

<u>This means that:</u>
x - 4 = x - c
<u>Now, we solve for c:</u>
x - 4 - x = x - c - x
-4 = -c
c = 4

Hope this helps :)
6 0
3 years ago
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