Answer:
1st: 0 solutions
2nd: infinitely many solutions
3rd: 1 solution
Step-by-step explanation:
1st: add both equations and the result is 0 = 4 ⇒ inconsistent, no solution
2nd: add both equations and the result is 0 = 0 ⇒ it's true, for all x and y values
3rd: add both equations and obtain: 16x = 32 ⇒ x = 2,
then if you want to obtain y, replace x in any of both equations.
Conclusion is that only 1 solution (x = 2 and a unnique value for y) is obtained.
