Question 1046442
{0.25x	+ 0.4y	= −3
{0.5x	− 0.6y	= 8

Multiply the top by -2, and the x will be the same with opposite signs.
-0.50x-0.8y=6
0.5x-0.6y=8.  Now add them.
-1.4y=14
y=-10
Substitute into the first to get x
0.25 x-4=-3
0.25x=-1
x=-4

Check by using the second
2-(-6)=8  checks.
(4,-10) are the solutions.