Question 278510
4X+Y=17 MULTIPLY BY -3 & ADD. 
2X+3Y=21
-12X-3Y=-51
--------------
-10X=-30
X=-30/-10
X=3 ANS.
4*3+Y=17
12+Y=17
Y=17-12
Y=5 ANS.
PROOF:
2*3+3*5=21
6+15=21
21=21