What is the main idea of this famous speech from act v of the tragedy of macbeth by william shakespeare?

MACBETH. … all our yesterdays have lighted fools The way to dusty death. Out, out, brief candle! Life’s but a walking shadow, a poor player That struts and frets his hour upon the stage And then is heard no more. It is a tale Told by an idiot, full of sound and fury Signifying nothing. What is the main idea of this famous speech from Act V of The Tragedy of Macbeth by William Shakespeare?

Macbeth is realizing that all of his striving for power has been for nothing.

In this speech he refers to how ephemeral life is, it is only a shadow that comes and goes every day. It is a story that each person tells and he feels idiotic to tell his.  When facing death Macbeth realizes that all of his striving for power has been for nothing.

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x=4, y=4

step-by-step explanation:

y=2x-4;

x+2y=12

we can use substitution since the first equation is solved for y

where ever you see y in the second equation, replace it with 2x-4

x + 2(2x-4) = 12

distribute the 2

x+4x-8 = 12

combine like terms

5x-8=12

add 8 to each side

5x-8+8=12+8

5x=20

divide by 5

5x/5 = 20/5

x =4

we still need to solve for y

y = 2x-4

we know x =4

y = 2(4) -4

y = 8-4

y=4