Question

Lucia tried to solve the system below

2x+2y=14

Answer 1

A.

When Lucia solved the second equation for x, she subtracted 2y from both sides.

Explanation:

Lucia made a mistake when she rewrote the formula

To rewrite the formula to x is a function of y. we have to add 2y to both sides of the formula. Instead of adding 2y, Lucia subtracted 2y from the right side.

Instead of what she did, x should be written the following way

Answer 2

move x to the other side.

2y = -2x + 14

divide by 2.

y = -x + 7

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