Answer:
xy=2
Step-by-step explanation
2x + 3y =12
First divide 2 on both sides of the equation, than divide 3 on both sides of the equation.
Answer:
-156250
Step-by-step explanation:
The pattern is multiplying by -5.
2, -10, 50, -250, 1250, -6250, 31250, -156250
The answer is D, i.e. the system was solved via elimination
If you multiply the first equation by 5, the system becomes

If you sum the two equations, you get

And so if you substitute the second equation of system A with this new equation, you'll get system B.