5y+3y=2.4

To solve the equation \(5y + 3y = 2.4\), first combine like terms on the left side:

\[ (5y + 3y) = 8y \]

So the equation becomes:

\[ 8y = 2.4 \]

Next, divide both sides by 8 to solve for \(y\):

\[ y = \frac{2.4}{8} \]

Calculating that gives:

\[ y = 0.3 \]

Thus, the solution to the equation is:

\[ y = 0.3 \]