Solve for y
y=\frac{4}{7}\approx 0.571428571
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\frac{3}{7}+y=1
Divide 7 by 7 to get 1.
y=1-\frac{3}{7}
Subtract \frac{3}{7} from both sides.
y=\frac{7}{7}-\frac{3}{7}
Convert 1 to fraction \frac{7}{7}.
y=\frac{7-3}{7}
Since \frac{7}{7} and \frac{3}{7} have the same denominator, subtract them by subtracting their numerators.
y=\frac{4}{7}
Subtract 3 from 7 to get 4.
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