Marisa made a fruit salad. she used 1 cup of green
grapes and 3 cups of red grapes. she used twice as
many cups of blueberries as cups of grapes.
write an expression for the number of cups of
blueberries that marisa used. then evaluate the
expression. explain your reasoning.

b = 2(g + r)

Marisa used b = 8 cups of blueberries.

Step-by-step explanation:

Let g be the cups of green grapes, r be the cups of red grapes, and b be the cups o blueberries Marisa used..

then we know that

g = 1 (Marisa used 1 cup of green grapes)

r = 3 (Marisa used 3 cup of red grapes)

g + r = 4

Marisa used twice as may cups of blueberries as cups of grapes; this means

b = 2(g + r )

b = 2(4) = 8

Marisa used 8 cups pf blueberries.

the first one, all those points on the line just make a strait line.