Answer:
Question 1
No solution
Question 3
No solution
Step-by-step explanation:
Given the pair of equations:
5x + 2y = -7
15x + 6y = 21
Notice that the second equation can be obtained by mulitiplying the first equation by 3, this makes the pair have no solution.
A pair of equations where one is a multiple of the other has no soution.
Similarly for
6x + 4y = 10
3x + 2y = 5
No solution