Super hard question :0 what is 3+3

Find the solution of system of equation y= x-4 y=4x+2

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.

Find the solution of this system of equation -7x+y=-20 9x-3y=36