Question

x + 5y = -2
2x + y = 5
The point of intersection of the lines has a y-coordinate of

Answer 1

To find the point of intersection of the 2 lines you need to solve the simultaneous equations:
\[x + 5y = -2\]
\[ 2x + y = 5\]
Try taking 2 lots of the first equation away from the second, and see what you get.

Answer 2

Substitute y = 5 - 2x in x +5y = 2 -> x+25-10x= -2