Answer:
we need the listed four examples
Step-by-step explanation:
Multiply the first equation by -1
-3x-y=-4
2x+y=5
Add them up
-x=1
So x=-1
And y=7
So the first option is correct
-80\112 = -5\7
we divided both numbers by 16
broke
----$$$$$$$
52.5
Diagonal =