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\frac{y-3}{2}=\frac{x-1}{2-1}
Subtract 3 from 5 to get 2.
\frac{y-3}{2}=\frac{x-1}{1}
Subtract 1 from 2 to get 1.
\frac{y-3}{2}=x-1
Anything divided by one gives itself.
\frac{1}{2}y-\frac{3}{2}=x-1
Divide each term of y-3 by 2 to get \frac{1}{2}y-\frac{3}{2}.
x-1=\frac{1}{2}y-\frac{3}{2}
Swap sides so that all variable terms are on the left hand side.
x=\frac{1}{2}y-\frac{3}{2}+1
Add 1 to both sides.
x=\frac{1}{2}y-\frac{1}{2}
Add -\frac{3}{2} and 1 to get -\frac{1}{2}.
\frac{y-3}{2}=\frac{x-1}{2-1}
Subtract 3 from 5 to get 2.
\frac{y-3}{2}=\frac{x-1}{1}
Subtract 1 from 2 to get 1.
\frac{y-3}{2}=x-1
Anything divided by one gives itself.
\frac{1}{2}y-\frac{3}{2}=x-1
Divide each term of y-3 by 2 to get \frac{1}{2}y-\frac{3}{2}.
\frac{1}{2}y=x-1+\frac{3}{2}
Add \frac{3}{2} to both sides.
\frac{1}{2}y=x+\frac{1}{2}
Add -1 and \frac{3}{2} to get \frac{1}{2}.
\frac{\frac{1}{2}y}{\frac{1}{2}}=\frac{x+\frac{1}{2}}{\frac{1}{2}}
Multiply both sides by 2.
y=\frac{x+\frac{1}{2}}{\frac{1}{2}}
Dividing by \frac{1}{2} undoes the multiplication by \frac{1}{2}.
y=2x+1
Divide x+\frac{1}{2} by \frac{1}{2} by multiplying x+\frac{1}{2} by the reciprocal of \frac{1}{2}.