Write a variable expression for each statement 9. six decreased by a number 12

10. the quotient of a number and

11. the product of five and a number increased by two

12. seven less than a number

13. four times the sum of ten and a number

14. twenty less a number

15. the difference of 10 and a number

16. the quotient of 14 and a number

17. a number increased by 17

18. half of 14

19. a number increased by 6

20. the product of x and 7

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.