Given an arithmetic sequence where a1=xa_1 = xa1=x and a2=x+ya_2 = x+ya2=x+y, what is the kthk^{th}kth term?
x+kyx + kyx+ky
x+(k−1)yx + (k-1)yx+(k−1)y
kx+ykx + ykx+y
ky+(k−1)xky + (k-1)xky+(k−1)x