10 problem: two friends, alejandra and mia, agreed to split the check at a restaurant. alejandra ordered $12 worth of food and mia ordered $18 worth. at the end of the meal, alejandra put her $12 contribution on the table, plus a 20% tip and mia put her $18 contribution on the table, plus a $15% tip. the total tip left by alejandra and mia is equal to r% of the total check for their table, where the "total check" amount does not include the tip. what is r?

Look at this system of equations. -3x + 3y = 12 y = x + 4 the solution set of this system is best explained by which of these statements? a) the graphs of the equations are the same line because the equations have the same slope and the same y-intercept. the system has infinitely many solutions. b) the graphs of the equations are parallel lines because they have the same slope but different y-intercepts. the system has no solution. c) the graphs of the equations are lines that intersect at one point because the equations have the same slope but different y-intercepts. the system has exactly one solution. d) the graphs of the equations are lines that intersect at one point because the equations have the same slope and the same y-intercept. the system has exactly one solution.