To determine how many solutions the given system of equations has, we will analyze the equations:
- \( 12x - 15y = 18 \)
- \( 4x - 5y = 6 \)
First, let's rewrite the first equation for clarity:
- \( 12x - 15y = 18 \)
- \( 4x - 5y = 6 \)
Notice that the second equation can be multiplied by 3 to see if it is a multiple of the first equation:
\[ 3(4x - 5y) = 3 \cdot 6 \]
That gives us:
\[ 12x - 15y = 18 \]
Now, we see that both equations are actually identical:
- \( 12x - 15y = 18 \)
- \( 12x - 15y = 18 \)
Since both equations represent the same line, there are infinitely many solutions to this system. Thus, the final answer is:
infinitely many solutions.