Question 1 solve the system of equations and choose the correct answer from the list of options. d + e = 15 −d + e = −5 label the ordered pair as (d, e). a (0, 0) b (10, −5) c (5, 10) d (10, 5) question2 a set of equations is given below: equation s: y = x + 9 equation t: y = 2x + 1 which of the following steps can be used to find the solution to the set of equations? a x = 2x + 1 b x + 9 = 2x c x + 1 = 2x + 9 d x + 9 = 2x + 1 question 3 a set of equations is given below: equation c: y = 6x + 9 equation d: y = 6x + 2 which of the following options is true about the solution to the given set of equations? a one solution b no solution c two solutions d infinite solutions question 4 solve the system of equations and choose the correct answer from the list of options. 2x + y = −4 y = 3x + 2 a negative 6 over five comma negative 8 over 5 b negative 8 over 5 comma negative 6 over 5 c negative 5 over 6 comma negative 11 over 5 d negative 11 over 5 comma negative 6 over 5 question 5 a system of equations is given below: y = –2x + 1 6x + 2y = 22 which of the following steps could be used to solve by substitution? a 6x + 2(−2x + 1) = 22 b −2x + 1 = 6x + 2y c 6(−2x + 1) + 2y = 22 d 6(y = −2x + 1)