Question 18 The answer is 4 days. Because, Kevin =3×n Anita =4+ (2×n) Equating the two equations. 3n=4+2n 3n-2n=4 n=4
Question 19 When the solution is (4,1), it means the value of y=1 and x=4. The answer is; y=x-3 y=-3x+13. Since when the values of x and y are substituted they satisfy the system.
Question 20 The system has no solution. This is because the line are parallel and they do not intersect to give a solution.
