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lisabon 2012 [21]
3 years ago
8

I cant figure out the mistake on #2. Please help?

Mathematics
1 answer:
Mrac [35]3 years ago
4 0
The problem she commited was not substituting properly
x-y=7
subtracting x from both sides
-y=7-x
multiplying the whole equation by -1
y=-7+x
the first equation is
2{x}^{2} - 6x + 4 = y
so substituting it should be
2 {x}^{2} - 6x + 4 = - 7 + x
subtracting x it should be
2 {x}^{2} - 6x + 4 - x = - 7
which clearly means she did not substitute correctly
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