If x = 2, y = 3 and 2 = 5, find the value of;

(a) 2x + y + z

(b) 4x -y + z

(c) x – y + z

(a) Given that: x – 2, y = 3 and z = 5

∴ 2x + y + 2 = 2 x 2 + 3 + 5

= 4 + 3 + 5 = 12

(b) 4x – y + z = 4 x 2 – 3 + 5

= 8 – 3 + 5 = 5 + 5 = 10

(c) x – y + z = 2 – 3 + 5 = -1 + 5 = 4