2 years ago

C an some one help me

Mathematics

1 answer:

Pavlova-9 [17]2 years ago

8 0

Answer:

Step-by-step explanation:

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Elimination method: ax+by=r, -bx+cy=s

Alex17521 [72]

$\left[\begin{array}{ccc}ax+by=r\\\\-bx+cy=s\end{array}\right]$

Isolate x for $ax+by=r$

$x= \frac{r-by}{a} ; a \neq 0$

Subsititute $x= \frac{r-by}{a}$

$-b \frac{r-by}{a} +cy=s$

Isolate r for : $-b \frac{r-by}{a}+cy=s$

$r=- \frac{as-acy-b^2y}{b} ; a \neq 0;b \neq 0$

For x : $\frac{r-by}{a}$

Subsititute r = $- \frac{as-acy-b^2y}{b}$

$x= -\frac{as-acy-b^2y}{b}/a$

$x = \frac{cy-s}{b}$

The solutions to the system of equations are:

$r= -\frac{as-acy-b^2y}{b}$ and <span> $x = \frac{cy-s}{b}$
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hope this helps!

3 0

2 years ago

To find 12×13 I double 13 and halve 12 and multiply what's an exspression for this

Brilliant_brown [7]

Expression: x × y = x/2 × 2y

4 0

3 years ago

Solve x^2-8x=3 by completing the square. Which is the solution set of the equation

kkurt [141]

Answer:

{-0.36, 8.36) to the nearest hundredth.

Step-by-step explanation:

x^2 - 8x = 3

(x - 4)^2 - 16 = 3

(x - 4)^2 = 19

Taking square roots:

x - 4 = +/- √19

x = 4 +/- √19

x = {-0.36, 8.36} to nearest 1/100.

4 0

3 years ago

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Explain the function y=-(x+2)^2-3

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warwar

Step-by-step explanation:

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2 years ago

Which pairs of numbers have the same absolute value? How are these numbers related?

NeTakaya

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4=4

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2 years ago

C an some one help me​

C an some one help me