2x + 6y = 5 ax+by = 7
If the system of equations above has only one
solution, which of the following could be the values
of a and b?
A) a=1 and b=3
B) a= 2 and b = 6
C) a=3 and b = 8
D) a = 4 and b=12

Help me please I need a explanation for this question please

This graph represents four ecosystems. each ecosystem has a different number of species, adding to its biodiversity. different colors represent different species. which statements correctly summarize the data depicted by the graph? 1. ecosystem d has more biodiversity than ecosystem c. 2. ecosystem b has more biodiversity than all the other ecosystems. 3. ecosystem a has more biodiversity than ecosystem b but less biodiversity than ecosystem c. 4. ecosystem b has more biodiversity than ecosystems c and d but less biodiversity than ecosystem a. 5. ecosystem a has more biodiversity than ecosystem c but less biodiversity than ecosystem b.