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3 years ago

Would this be D or b

Mathematics

2 answers:

Arte-miy333 [17]3 years ago

4 0

Answer:

Step-by-step explanation:

use (y2-y1)/(x2-x1) to find the slope. So,

(-8.2--5)/(-2-0)= 1.6

And when x is 0 it shows that y=-5 which is b (the y-intercept)

so the equation is y=1.6x-5

Luba_88 [7]3 years ago

3 0

you’re doing it wrong, at least that’s what my teacher told me not to do. use the slope formula:

y1 - y2/x1 - x2 (only for the top part, but i guess your way worked that time)

the answer is, however, b. the y intercept is -5, because it crosses over a 0 on the y axis

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The matrix is not properly formatted.

However, I'm able to rearrange the question as:

$\left[\begin{array}{ccc}1&1&1|-1\\-2&3&5|3\\3&2&4|1\end{array}\right]$

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Please note that the above may not reflect the original question. However, you should be able to implement my steps in your question.

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Step-by-step explanation:

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$\left[\begin{array}{ccc}1&1&1|-1\end{array}\right]$

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$2 * \left[\begin{array}{ccc}1&1&1|-1\end{array}\right] = \left[\begin{array}{ccc}2&2&2|-2\end{array}\right]$

Add to row 2 elements are: $\left[\begin{array}{ccc}-2&3&5|3\end{array}\right]$

$\left[\begin{array}{ccc}2&2&2|-2\end{array}\right] + \left[\begin{array}{ccc}-2&3&5|3\end{array}\right]$

$\left[\begin{array}{ccc}0&5&7|1\end{array}\right]$

The second operation:

$-3R_1 +R_3 ->R_3$

This means that the new third row (R3) is derived by:

Multiplying the first row (R1) by -3; add this to the third row

The row 1 elements are:

$\left[\begin{array}{ccc}1&1&1|-1\end{array}\right]$

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$-3 * \left[\begin{array}{ccc}1&1&1|-1\end{array}\right] = \left[\begin{array}{ccc}-3&-3&-3|3\end{array}\right]$

Add to row 2 elements are: $\left[\begin{array}{ccc}3&2&4|1\end{array}\right]$

$\left[\begin{array}{ccc}-3&-3&-3|3\end{array}\right] + \left[\begin{array}{ccc}3&2&4|1\end{array}\right]$

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Hence, the new matrix is:

$\left[\begin{array}{ccc}1&1&1|-1\\0&5&7|1\\0&-1&1|4\end{array}\right]$

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