Green string was 2.37 cm long the blue string was 4 cm long how many centimeters longer the blue string than the green string

Which term best describes the association between variables a and b? no association a negative linear association a positive linear association a nonlinear association a scatterplot with an x axis labeled, variable a from zero to ten in increments of two and the y axis labeled, variable b from zero to one hundred forty in increments of twenty with fifteen points in a positive trend.

The sum of two numbers is 12 and their difference is 18 what are the two numbers

Solve: 3x+y=6 4x-2y=18 show all work !