I need this help in math pls

What is the simplified expression for 6(2(y+x))

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.

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10