Answer: UNDEFINED
Explanation:
x=-5y+4 5y=-x+4 y=-1/5x+4/5
3x+15y= -1 15y=-3x-1 y=-1/5x-1/15
COMBINED: -1/5x+4/5=-1/5x-1/15 FIND COMMON DENOMINATOR=15
-3/15x=-3/15x-13/15
0=-13/15 UNDEFINED
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