How do you find if a linear equation has more than one solution

If a linear system has more than one solution, then the kernel of the coefficient matrix is a nonzero subspace, and the solution set is an affine subspace parallel to the kernel. So, (over an infinite field), the solution set must be infinite. The definition of a linear system is your key.

answer: a

step-by-step explanation: the answer is a due to the rule of symmetry; that a line of symmetry must divide a figure into 2 pieces that are the exact same, only reflected over a line of symmetry. b and c do not have lines of symmetry and would not divide the figure evenly, thus making the answer a.