6. Mr Chua's car consumes petrol at an average rate of 8 litres daily. Before Mr Chua begins his journey,

he tops up the petrol in his car to 100 litres. Given

that he will next top up the petrol in his car when

there are 20 litres left, form an inequality and solve

it to find the maximum number of days he can travel

before he has to top up the petrol in his car. 10

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.