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CBSE Class 9 Answered

what is linear equations
Asked by guntursowmya57 | 16 Mar, 2021, 07:39: PM
answered-by-expert Expert Answer
An equation gives a straight line when plotted on a graph is called as a Linear Equation.
In Linear equations the exponent/power on the variable is always 1.  
 
1. Linear Equation in one variable: An equation of the form ax + b = 0, where a, b are real numbers and x is a varible is called a Linear Equation in one variable.
Examples: 2x + 3 = 0,  y = 1,  4y - 8 = 0 etc
 
2. Linear Equation in two variables:
An equation of the form ax + by + c = 0, where a, b and c are real numbers, x and y are the variables is called a Linear Equation in two variable.
Examples: 2x + 3y + 1 = 0,  y + z = 1 etc
Answered by Renu Varma | 16 Mar, 2021, 11:20: PM

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CBSE 9 - Maths
A lending library has a fixed charge for the first three days and an additional charge for each day there after. Neeru paid Rs. 21 for a book kept for five days . Write a linear equation which satisfies this data. Draw trhe graph for the same.
Asked by manmeetsaini1516 | 30 Jun, 2022, 09:36: AM
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CBSE 9 - Maths
Two cell phone companies offer different packages. Company A charges a fixed monthly fees of  Rs 34 plus Rs 0.5/ minute talk time. Company B charges a fixed monthly fees of Rs 40 plus Rs  0.4 / minute talk time. Take x as the charges per minute for the talk time and y as the total amount. Based on above information answer the following question: (i) Linear equations representing the packages of a company A and B are : (a) y=34 + 0.5 x, y= 40 +0.4 x (b) y=34 + 0.4 x, y= 40 +0.5 x (c ) x=34 + 0.5 x, y= 40 +0.4 y (d) x=34 + 0.4y, y= 40 +0.5y (ii) If the average number of minutes used monthly by Sunil is 1160, then which of the  following is true? (a) Company A offers the better package (b)Company B offers the better  package (c ) Both companies offer the same package (d) None of the above (iii) If Sunita pays a total bill of Rs 208 to company B then the number of minutes used  by her : (a) 400  (b) 420 (c) 410 (d)390 (iv) The shape of the graph represented by the equations in part (i) is : (a) Rectangle (b) Circle (c) Parabola (d) Pair of lines (v) The number of minutes of talk time that results in equal monthly bills from both the  companies is : (a) 50  (b) 60  (c) 55  (d)65  
Asked by snehameenu656 | 31 May, 2022, 11:12: PM
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CBSE 9 - Maths
if this is a ball that cost 20 ruppe and a bat that cost 100 ruppe but the bat cost 10 ruppe more what is the total cost of ball and bat ?
Asked by nisalya.thakkar | 13 May, 2022, 09:01: PM
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CBSE 9 - Maths
The car is moving with a speed of 60 km/h, travels y km distance in x hours. Represent this statement as a linear equation of two variables and draw the graph. Read from the graph, distance travelled when time is (i) 5 hours, (ii) 10 hours.
Asked by suhasinikhuba | 21 Jun, 2021, 08:00: PM
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CBSE 9 - Maths
what is linear equations
Asked by guntursowmya57 | 16 Mar, 2021, 07:39: PM
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CBSE 9 - Maths
Express 2x = 5y in the form ax + by + c = 0Express 2x = 5y in the form ax + by + c = 0Express 2x = 5y in the form ax + by + c = 0
Asked by swatipuspapatel | 08 Feb, 2021, 06:51: PM
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CBSE 9 - Maths
The number of girls in class IX is 2 more than thrice the number of boys.  Represent the above statement by a linear equation in variables ‘x’ and   ‘y’.
Asked by ameinofurtado | 20 Jan, 2021, 04:52: PM
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CBSE 9 - Maths
In △ABC and △DEF , AB = FD , and ∠A = ∠D . The two triangles will be congruent by SAS axiom if
Asked by riya.yanamandra | 18 Oct, 2020, 12:08: PM
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CBSE 9 - Maths
The point (m, -m) always lies on the line. x=m y=-m x+y=0 x=y
Asked by sankalpbanerjee4831g | 28 Sep, 2020, 08:22: PM
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CBSE 9 - Maths
A two digit number is 1 less than twice the number obtained after reversing the digits. Form a linear equation in two variables for the given situation and express it in standard form.
Asked by dbijraj.saikia | 20 Aug, 2020, 07:39: PM
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