Answer:
to find x and y , we have to use simultaneous equations
3x-0.5y=6
-2x-y=4
if you want to cancel y and find x, multiply the first equation by 2 and subtract the 2 equations
= 6x-y=12
--2x-y=4
= 8x=8
x=1
substitute
(3*1)-0.5y=6
3-0.5y=6
-0.5y=3
y=-6
check: 3-(0.5*-6)=6
3--3=6
3+3=6
6=6
and -2+-(-6)=4
-2--6=4
-2+6=4
4=4
