High school
posted by Habtamu Mareba on .
Maths;{2X2Y=4+{3X+4Y=6

are you solving the 2 equations
2x2y = 4
3x+4y = 6 ???
double the 1st, then add it to the 2nd
4x4y=8
3x+4y=6
7x = 14
x = 2
into the 1st:
4  2y = 4
2y = 0
y = 0
x=2 , y = 0