If y = 2x and z = 5y, then x + 3y + z = ?
- 15x
- 17x
- 16x
- None of these
Explanation
Given:
y = 2x
z = 5y
First find z in terms of x:
z = 5y = 5 _ (2x) = 10x
Now substitute in x + 3y + z:
x + 3y + z = x + 3_(2x) + 10x
= x + 6x + 10x
= 17x
Last verified on 05-08-2026
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