Question

Theo solved the following problem correctly for homework.

2 x + y = 7. Negative 3 x + y = 2.

What is the y-coordinate of his solution?
y = negative 3
y = negative 1
y = 1
y = 5

Answer 1

y=5

Explanation:

OK, let see, 2x+y=7, –3x+y=2:

`2x + y = 7 \\ - 3x + y = 2 \\ we \: need \: to \: solve \: the \: equation \: so \\ - 2x - y = - 7 \\ - 3x + y = 2 \\ - 5x = - 5 = = > x = 1 \\ 2(1) + y = 7 = = = > y = 5`