Solve for y
y=-5
Graph
Share
Copied to clipboard
15-\left(-3y\right)-\left(-8\right)=8
To find the opposite of -3y-8, find the opposite of each term.
15+3y-\left(-8\right)=8
The opposite of -3y is 3y.
15+3y+8=8
The opposite of -8 is 8.
23+3y=8
Add 15 and 8 to get 23.
3y=8-23
Subtract 23 from both sides.
3y=-15
Subtract 23 from 8 to get -15.
y=\frac{-15}{3}
Divide both sides by 3.
y=-5
Divide -15 by 3 to get -5.
Examples
Quadratic equation
{ x } ^ { 2 } - 4 x - 5 = 0
Trigonometry
4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
Arithmetic
699 * 533
Matrix
\left[ \begin{array} { l l } { 2 } & { 3 } \\ { 5 } & { 4 } \end{array} \right] \left[ \begin{array} { l l l } { 2 } & { 0 } & { 3 } \\ { -1 } & { 1 } & { 5 } \end{array} \right]
Simultaneous equation
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Limits
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}