0
Anonymous
x = sqrt 100
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10
There are 2 unknowns
2x - 4 = -10 2x = -10 +4 2x = -6 x = -3
Multiply first equation by 2: 4x - 2y = 20 Subtract second equation: x = 12, so y = 14.
It is an equation and the value of x works out as 88