Answer:
5 8
Step-by-step explanation:
Coefficient of x should be 5 so first ? should be 5 let the second ? = z
5×6-9×z=-42
30+42=9z
z=8
5x-9y-42=5(x+6)-9(y+8)
given 5x-9y-42=5x-9y-72+30
=5x+30-9y-72
=5(x+6)-9(y+8)
hence 5x-9y-42=5(x+6)-9(y+8)
19,17,15,13
25-6=19
25-8=17
25-10=15
25-12=13
