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maria [59]
3 years ago
10

Good at math & need points? help!!

Mathematics
1 answer:
Greeley [361]3 years ago
5 0

Answer:

5

Step-by-step explanation:

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To solve this system of equations by elimination, what operation could be used to eliminate the x-variable and find the value of
babymother [125]

Answer:

The value of y is y=\frac{42}{17}

Step-by-step explanation:

we have

4x+3y=6 -----> equation A

18x+5y=6 -----> equation B

To eliminate the x-variable and find the value of y Multiply the equation A by -18/4 both sides or multiply the equation B by -4/18 both sides

I choice

Multiply the equation A by -18/4 both sides

(-18/4)[4x+3y]=6*(-18/4)

-18x-13.5y=-27 ------> equation C

Adds equation B and equation C

18x+5y=6\\-18x-13.5y=-27\\-------\\5y-13.5y=6-27\\-8.5y=-21\\\\ y=\frac{42}{17}

7 0
3 years ago
Explain the steps to finding the vertex of g(x) = 3x2 + 12x + 15
RUDIKE [14]

Answer:

The vertex of this parabola, (-2, 3), can be found by completing the square.

Step-by-step explanation:

The goal is to express this parabola in its vertex form:

g(x) = a\, (x - h)^2 + k,

where a, h, and k are constants. Once these three constants were found, it can be concluded that the vertex of this parabola is at (h,\, k).

The vertex form can be expanded to obtain:

\begin{aligned}g(x)&= a\, (x - h)^2 + k \\ &= a\, \left(x^2 - 2\, x\, h + h^2\right) + k = a\, x^2 - 2\, a\, h\, x + \left(a\,h^2 + k\right)\end{aligned}.

Compare that expression with the given equation of this parabola. The constant term, the coefficient for x, and the coefficient for x^2 should all match accordingly. That is:

\left\lbrace\begin{aligned}& a = 3 \\ & -2\,a\, h = 12 \\& a\, h^2 + k = 15\end{aligned}\right..

The first equation implies that a is equal to 3. Hence, replace the "a\!" in the second equation with 3\! to eliminate \! a:

(-2\times 3)\, h = 12.

h = -2.

Similarly, replace the "a" and the "h" in the third equation with 3 and (-2), respectively:

3 \times (-2)^2 + k = 15.

k = 3.

Therefore, g(x) = 3\, x^2 + 12\, x + 15 would be equivalent to g(x) = 3\, (x - (-2))^2 + 3. The vertex of this parabola would thus be:

\begin{aligned}&(-2, \, 3)\\ &\phantom{(}\uparrow \phantom{,\,} \uparrow \phantom{)} \\ &\phantom{(}\; h \phantom{,\,} \;\;k\end{aligned}.

8 0
3 years ago
Solve -8 = -4k PLEASE IM BEGGING
kifflom [539]
K=2 is the correct answer
7 0
3 years ago
What is the perimeter of the parallelogram?
qwelly [4]

Answer:

16

Step-by-step explanation:

4units x 4units = 16

8 0
3 years ago
Read 2 more answers
How can linear approximation be used to approximate the change in y​ = f(x) given a change in​ x? To approximate the change Uppe
AnnZ [28]

Answer:

I only want free points

Step-by-step explanation:

Thank you for the free points.

6 0
4 years ago
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