If \(x + 2y = 14\) and \(x - y = 5\), find x.
8
Subtract the second equation from the first to eliminate x:
\((x + 2y) - (x - y) = 14 - 5\) \(\Rightarrow\) \(3y = 9\) \(\Rightarrow\) \(y = 3\).
Substitute y = 3 into the second equation: \(x - 3 = 5\) \(\Rightarrow\) \(x = 8\).
Hence, x = 8.
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Important Questions from Basic Concepts
The friction force exerted by air on a moving body is called ----
A series of processes to joint various parts to get a complete product is known as _____
The fixing of different parts of a machine properly as per the requirement is called _____.
Arrange the following lamps based on the increasing power rating and energy consumption to provide the same level of Illumination or lighting
A. Incandescent Lamp with efficacy of 10 lumens/watt
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C. Halogen lamp with efficacy of 20 lumens/watt
D. Mercury vapour lamp with efficacy of 40 lumens/watt
E. Light Emitting diode (LED) lamp with efficacy of 80 lumens/watt
Choose the correct answer from the options given below:
- The device in machine which feeds thread in sufficient quantity and tightens loop is :
