Solve for n
n=\frac{91-y}{2}
Solve for y
y=91-2n
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n+y+n=91
Add n to both sides.
2n+y=91
Combine n and n to get 2n.
2n=91-y
Subtract y from both sides.
\frac{2n}{2}=\frac{91-y}{2}
Divide both sides by 2.
n=\frac{91-y}{2}
Dividing by 2 undoes the multiplication by 2.
y=91-n-n
Subtract n from both sides.
y=91-2n
Combine -n and -n to get -2n.
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\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
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Limits
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