Answer:
Elena incorrectly used the slant height instead of the height.
Step-by-step explanation:
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x+y=4 -----1
x-y=6 ----2
adding equation 1 and 2 we get
2x=10
x=5
from equation 1 we get
5+y=4
y=-1
Since a definite value of x and y exists therefore the set of equations are consistent.
Hope this helps.
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