Solve the system of equations by elimination 3x+4y=9
-6x-8y=-18

A. (5,-1)
B. (5,1)
C. Infinite number of solutions
D. (1,5)

If you can, explain step by step please

What is the probability of throwing several dice with sum equal to 6 (six)? show the ways of possibilities for sum 6 (as the numerator) and the ways of throwing n dices for n = 1, 2, 3, 4 or 5 as denominator for all the questions to earn full credits. (a)throw one die, (b) throw two dice, (c) throw three dice (d) throw 4 dice, (e) throw 5 dice