1 Answer

Reid Ballard · Answer 1 · 2023-09-11T19:42:05+0000

Answer:

(3;-2)

Explanation:

Let's add together the two equations

$I + II : x-8y +9x +8y = 19+11 \rightarrow 10x=30 \rightarrow x =3$

At this point I would recommend simply using the value of x in the firs equation to find y.
$3-8y=19 \rightarrow -8y=16 \rightarrow y=-2$

Or just multiply the first by 9 and subtract the second.

$9* I-II: 9x-72y-9x-8y=171-11 \rightarrow -80y=160 y=-2$

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