Choice C is the correct answer. Let's simplify the first equation.

Step 1: Divide the first equation by 7: $\frac{7x - 14y}{7} = \frac{21}{7}$$x - 2y = 3$

This is exactly the second equation!

Step 2: Both equations represent the same line, 💡 Strategic Tip: Always simplify equations by factoring out common factors before comparing.

Choice A is incorrect because no solution requires parallel lines with different constants.

Choice B is incorrect because one solution requires different slopes.

Choice D is incorrect because linear equations cannot have exactly three solutions.