Twice a number decreased by three

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

Yuto and hila attempted to solve the same inequality. their work is shown below. which statement is true about the work shown above? yuto is correct because he isolated the variable correctly and reversed the inequality symbol. yuto is incorrect because he should not have reversed the inequality symbol. hila is correct because she isolated the variable correctly and reversed the inequality symbol. hila is incorrect because she should not have reversed the inequality symbol.

Need 50 will mark brainliest answer. find the lengths of all the sides and the measures of the angles.