Once you have $5y$ by itself, what operation will isolate $y$ from $5y$?

After you know the value of $y$, multiply it by 3 to get $3y$.

In Desmos, in the first line, type y = 5x - 10. Then find the x-intercept of this line (the point where the graph crosses the x-axis). The x-coordinate of that point is the solution to $5x - 10 = 0$, which matches the value of $y$ in the original equation.

In a new line, type 3 * (value) where value is the x-coordinate you found from the intercept (the solution of the equation). The output of this expression is the value of $3y$.

Start with the equation:

Add 10 to both sides to get rid of the $-10$:

Now divide both sides of $5y = 10$ by 5 to solve for $y$:

So the value of $y$ is 2.

You are asked for $3y$, not just $y$. Substitute $y = 2$ into $3y$:

So the value of $3y$ is 6.