Half a league, half a league,
Half a league onward,
All in the valley of death
Ride the six hundred.
“Forward, the Light Brigade!
Charge for the guns!” he said:
Into the valley of death
Rode the six hundred

Photo has the answers

One stressed syllable and two unstressed syllables

Explanation:

The author Lord Alfred Tennyson uses the tryambic meter in this poem.

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substitute y = 2x - 4 to x + 2y = 12:

x + 2(2x - 4) = 12     use distributive property

x + (2)(2x) + () = 12

x + 4x - 8 = 12     add 8 to both sides

5x = 20     divide both sides by 5

x = 4

put the value of x to the first equation:

y = 2(4) - 4

y = 8 - 4

y = 4

it is believed to be alfred, lord himself