Determine weather the equation represents a direct variation if it does find the constant variation
-12x=6y

A. Not direct variation
B. Direct variation, constant variation 1/2
C. Direct variation, Constant of Variation is 2
D. Direct variation, constant of variation is -2

Imogene invested $8,000 in a bank account that pays 8 percent simple interest at the end of each year. her friend invested the same amount in stocks where the growth of the investment is represented as 2,000 times the square root of 2 less than the time lapsed in years. if y1 and y2 represent the amount earned in dollars and t is the time lapsed in years, which system of equations correctly represents the situation?

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

Prove the divisibility of the following numbers: 25^9 + 5^7 is divisible by 30.also, read as (25 to the power of 9) + (5 to the power of 7) is divisible by 30. blank x 30what is the blank? ( it should be expressed in exponent form)