Simplification Test 2

2x + y = 17 ...(i)
y + 2z = 15 ...(ii)
x + y = 9 ...(iii)
Subtracting equation (iii) from (i), we get x = 8
From equation (iii), 8 + y = 9 ⇒ y = 1
From equation (ii), 2z = 15 – 1 ⇒ z = 7
Now, 4x + 3y + z = 4 × 8 + 3 × 1 + 7 = 42