Answer:
option 3
Step-by-step explanation:
For option 1 :
2x - 8y = -10
-2x + 8y = 10 if we add two equation the result will be 0 = 0 which is we call infinitely many solutions
For option 2 :
2x - 8y = 1
-2x + 8y = 10 if we add like terms of the equations the result will be 0 = 11 and we call this no solutions
For option 3 :
4x + 2y = 18
-4x + 7y = 18 add the like terms and the result will be 9y = 36 and y = 4
therefore option 3 has only one solution.
