Eddie the elf made 15 toys one day in the workshop. Some were dolls and the rest were action figures. The number of action figures he made was one more than twice the number of dolls he made. Which systems shows how many dolls (d) and action figures (a) did Eddie make? a
d + a = 15 a = 2d + 1
b
d + a = 15 d = 2a + 1
c
2d+1a = 15
d
15 + 2d = a

Let us imagine that the number of automobile accidents in a certain region are related to the regional number of registered automobiles in tens of thousands (b1), alcoholic beverage sales in $10,000 (b2), and decrease in the price of gasoline in cents (b3). furthermore, imagine that the regression formula has been calculated as: y = a + b1x1 + b2x2 + b3x3 where y = the number of automobile accidents, a = 7.5, b1 = 3.5, b2 = 4.5, and b3 = 2.5 calculate the expected number of automobile accidents for a football weekend if the region has 25,000 registered vehicles, $75,000 worth of beer is sold, and a gas war causes a 10 cent drop in a gallon of gas.