WELCOME TO THE HIGHER MATHEMATICS CLASS

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WELCOME TO THE HIGHER MATHEMATICS CLASS SHIPAN CHANDRA DEBNATH ASSISTANT PROFESSOR & HEAD OF THE DEPARTMENT DEPARTMENT OF MATHEMATICS CHITTAGONG CANTONMENT PUBLIC COLLEGE scnctg@gmail.com

Which type of road this is ? Let us see a picture Which type of road this is ? Which road is endless?

THE STRAIGHT LINES Chapter - 3 Exercise -3.3 পৃষ্ঠা-৭৫ Book: Higher Mathematics Panjeree Publications

Learning Outcomes After complete this chapter students can Explain straight lines Sketch the graph of straight lines Explain the Slope of straight line Explain Different types straight lines (Till y=mx+c )

Definition of Straight Line : The locus of the set of points which maintain always equal distance from two fixed points is called Straight Line.

Observe the following problem Draw the graph of2x+3y=12 Solution: Here, 2x+4y=12 Find the values of y related to the values of x x 3 6 -3 y 4 2

Observe another problem Sketch the Graph of4x-5y-20=0 Here 4x-5y=20 Find the values of y related to the values of x x -5 -10 5 y -4 -8 -12

Graph

Slope of the Straight line: the slope or gradient of a line is a number that describes both the direction and the steepness of the line. Slope is often denoted by the letter m. The direction of a line is either increasing, decreasing, horizontal or vertical.

Equation of Straight lines about Axes Equation of x- axis y=0 Equation of y-axis x=0 Equation which is parallel to x axis y=b Equation which is parallel to y axis x=a

The Equation which makes angle with the positive direction x-axis y=xtan The Equation of st line which passes through the origin and slope is m becomes y=mx

A straight line which makes angle with the positive direction of x –axis and intercepts c from y axis becomes y=xtan +c A straight line intercepts b from y-axis and slope is m the equation becomes y=mx+b

11.একটি সরলরেখা উভয় অক্ষ হতে aও bঅংশ কেটে নেয় উহার সমিকরন হবে 12.মূলবিন্দু হতে একটি রেখার উপর অংকিত লম্বের দৈর্ঘ্য এবং উক্ত লম্ব অক্ষের সাথে কোণ উৎপন্ন করে উহার সমিকরন হবে 13.আদর্শ সরলরেখার সমীকরন হল ax+by+c=0

দলীয় কাজ 1.2x+4y=12 এর লেখচিত্র অংকন কর 2.6x-9y=18এর লেখচিত্র অংকন কর

মূল্যায়ন ১।ঢাল কাকে বলে ২। 2x+4y=12 এর ঢাল কত? ৩। ঢাল = ০ হলে সরলরেখার সমিকরন কী হবে? ৪। 2x+4y=12 এর ঢাল কত? ৫। 2x+4y=12 রেখা x অক্ষের সাথে যে কোন উৎপন্ন করে তার মান কত?

২. সরল রেখার সূত্রসমূহ শিখে আসবে। বাড়ীর কাজ 1.2x+4y=12 এর লেখচিত্র অংকন কর এবং উহার ঢাল ও খন্ডিত অংশের দৈর্ঘ্য কত? ২. সরল রেখার সূত্রসমূহ শিখে আসবে।

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