Having trouble on these type of questions. an explaination would be greatly appreciated

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.

X-intercept=-5 y-intercept=2 the equation of the line is

For what values of x is x2 + 2x = 24 true?