Class 11 Mathematics - Straight Lines - Slope of a line and angle between two lines Easy Quiz

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रेखा (y=2x+1) की ढाल क्या है?

What is the slope of the line (y=2x+1)?

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Correct Answer

B. 2

Explanation

Simple Explanation

रेखा के मानक रूप (y=mx+c) में (m) ढाल को दर्शाता है। यहाँ (y=2x+1) में (x) का गुणांक 2 है, इसलिए ढाल 2 है। विकल्प A में 1 को स्थिरांक समझने की भूल हो सकती है; 1, y-अवरोध है। परीक्षा टिप: (y=mx+c) में x का गुणांक सीधे ढाल होता है। / In the standard form (y=mx+c), (m) represents the slope. In (y=2x+1), the coefficient of (x) is 2, so the slope is 2. Option A results from confusing the constant term with the slope; 1 is the y-intercept. Exam tip: In (y=mx+c), the coefficient of x is directly the slope.

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रेखा \(y=4\) की ढाल क्या है?

What is the slope of the line \(y=4\)?

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Correct Answer

C. 0

Explanation

Simple Explanation

रेखा \(y=4\) में \(y\) का मान सभी \(x\) के लिए स्थिर रहता है, इसलिए यह एक क्षैतिज रेखा है। ढाल \(m=\frac{\Delta y}{\Delta x}\) में \(\Delta y=0\), अतः \(m=0\) होता है। विकल्प 1 सामान्यतः 45° की रेखा की ढाल से जुड़ा है, इस रेखा से नहीं। परीक्षा-युक्ति: \(y=c\) का ग्राफ हमेशा क्षैतिज होता है और उसकी ढाल 0 होती है। / In the line \(y=4\), the value of \(y\) remains constant for every \(x\), so the graph is horizontal. Using \(m=\frac{\Delta y}{\Delta x}\), we have \(\Delta y=0\), hence \(m=0\). The value 1 corresponds to a line rising 1 unit vertically for every 1 unit horizontally, not to this constant function. Exam tip: the graph of \(y=c\) is always horizontal and has slope 0.

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