3+y=-x
-5x+2y=8
solve in standard form

First answers x+y= -3 

5x-2y= -8

Rewrite in standard form
x+y = -3
the second equation is already in standard form.
now, solve for x
x = -3-y
substitute into the other equation and solve for y
-5 (-3 - y)+ 2y = 8
15 + 5y + 2y =8
15+ 7y =8
7y = -7
y= -1
now substitute into the original equation
x + -1 = -3
x = -2
answer (-2, -1)

4pounds of live bait and 1 pound of natural bait