Question

Lucia tried to solve the system below. What error did she make?

Answer 1

Lucia made a mistake when she rewrote the formula

`x - 2y = - 2`

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

`x = 2y - 2`