which of the following does not represent a system of linear equation in two variables

a. 2x + 5y = 7
x - 3y = 10
b. 3x + 9 = -4
x - 2 = 8
c. x - 7y = 5
3x + 2y > 15
d. 6x + 7 = 12
2y - 4 = 9

plss help Yong tama Sana sagot​