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3 years ago

14

Si a = 7; b = – 2 , entonces 6ab es:

1 answer:

aleksklad [387]3 years ago

3 0

$\implies {\blue {\boxed {\boxed {\purple {\sf {d. \: - 84}}}}}}$

$\sf \bf {\boxed {\mathbb {Step-by-step\:explanation:}}}$

✒ $\: 6\:a\:b$

Plugging in the value "a = 7" and "b = -2" in the above expression, we have

✒ $\: 6 \times 7 \times ( - 2)$

✒ $\: - 84$

$\large\mathfrak{{\pmb{\underline{\orange{Mystique35 }}{\orange{❦}}}}}$

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Answer:

(-2, 4, -2)

x=-2, y=4, z=-2.

Step-by-step explanation:

So we have the three equations:

$4x-y-2z=-8\\-2x+4z=-4\\x+2y=6$

And we want to find the value of each variable.

To solve this system, first look at it and consider what you should try to do.

So we can see that the second and third equations both have an x.

Therefore, we can isolate the variables for the second and third equation and then substitute them into the first equation to make the first equation all xs.

Therefore, let's first isolate the variable in the second and third equation.

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$z=-\frac{2-x}{2}$

So we've isolated the z variable. Now, do the same to the y variable in the third equation:

$x+2y=6$

Subtract x from both sides:

$2y=6-x$

Divide both sides by 2:

$y=\frac{6-x}{2}$

Now that we've isolated the y and z variables, plug them back into the first equation. Therefore:

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Distribute the third term. The -2s cancel out:

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