Mathematics, 09.10.2020 23:01, pito63

What error did Lucia make? When Lucia solved the second equation for x, she subtracted 2y from both sides,
O When Lucia solved for the value of y, she treated - 2y as 2y.
When Lucia solved for the value of x, she added 18 to both sides,
o When Lucia solved the second equation for x, she treated -2(-9) as 18 instead of -18.

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What error did Lucia make? When Lucia solved the second equation for x, she subtracted 2y from both...