Question 726298
ANSWER:
D
PROBLEM:
X+Y=6
X-Y=10
STEP(1)=====ADD THE TWO EQUATIONS TOGETHER TO ELIMINATE "Y"
2X=16
STEP(2)=====FIND "X"
X=8
STEP(3)=SUBSTITUTE THE VALUE FOR "X" INTO THE EQUATION 
TO SOLVE FOR"Y"
(8)+Y=6
Y=-2