#### Topics

##### Number Systems

##### Algebra

##### Geometry

##### Trigonometry

##### Statistics and Probability

##### Coordinate Geometry

##### Mensuration

##### Internal Assessment

##### Real Numbers

##### Pair of Linear Equations in Two Variables

- Linear Equations in Two Variables
- Graphical Method of Solution of a Pair of Linear Equations
- Substitution Method
- Elimination Method
- Cross - Multiplication Method
- Equations Reducible to a Pair of Linear Equations in Two Variables
- Consistency of Pair of Linear Equations
- Inconsistency of Pair of Linear Equations
- Algebraic Conditions for Number of Solutions
- Simple Situational Problems
- Pair of Linear Equations in Two Variables
- Relation Between Co-efficient

##### Arithmetic Progressions

##### Quadratic Equations

- Quadratic Equations
- Solutions of Quadratic Equations by Factorization
- Solutions of Quadratic Equations by Completing the Square
- Nature of Roots
- Relationship Between Discriminant and Nature of Roots
- Situational Problems Based on Quadratic Equations Related to Day to Day Activities to Be Incorporated
- Quadratic Equations Examples and Solutions

##### Polynomials

##### Circles

- Concept of Circle - Centre, Radius, Diameter, Arc, Sector, Chord, Segment, Semicircle, Circumference, Interior and Exterior, Concentric Circles
- Tangent to a Circle
- Number of Tangents from a Point on a Circle
- Concept of Circle - Centre, Radius, Diameter, Arc, Sector, Chord, Segment, Semicircle, Circumference, Interior and Exterior, Concentric Circles

##### Triangles

- Similar Figures
- Similarity of Triangles
- Basic Proportionality Theorem Or Thales Theorem
- Criteria for Similarity of Triangles
- Areas of Similar Triangles
- Right-angled Triangles and Pythagoras Property
- Similarity Triangle Theorem
- Application of Pythagoras Theorem in Acute Angle and Obtuse Angle
- Triangles Examples and Solutions
- Angle Bisector
- Similarity
- Ratio of Sides of Triangle

##### Constructions

##### Heights and Distances

##### Trigonometric Identities

##### Introduction to Trigonometry

##### Probability

##### Statistics

##### Lines (In Two-dimensions)

##### Areas Related to Circles

##### Surface Areas and Volumes

#### description

- Equations Reducible to Linear Equations

#### notes

In the earlier concepts we studied three methods to solve the Linear Equations, where we were directly provided with a linear equation which was in a standard form i.e `a_1x+b_1y+c_1=0` and `a_2x+b_2+c_2=0` . Here in this concept,we are required to reduce the given question into a proper linear equation and then solve it.

Example- `1/"x-1" + 2/"y-2" = 2` and `3/"x-1" - 3/"y-2" = 1`

First of all we need to reduce this equation in `a_1x+b_1y+c=0` and `a_2x+b_2y+c_2=0`

For that let's take `1/"x-1"` = m and `1/"y-2"` =n

So the equation becomes like, `m+2n=2` ....eq1

and `3m-3n=1` ....eq2

By solving further we get, `m=2-2n`, substituting this in eq2

`3(2-2n)-3n=1`

`6-6n-3n=1`

`-9n= 1-6`

`n= (-5)/-9` i.e `5/9`

Substitute `n=5/9` into eq1

`m+2(5/9)=2`

`m+ 10/9= 2`

`m= 2-10/9`

`m= 8/9`

Now we will resubstitute the values of m and n in the original equations

`1/"x-1"= 8/9`

`8x-8= 9`

`8x=17`

`x=17/8`

And `1/"y-2"= 5/9`

`5y-10= 9`

`5y= 9+10`

`y= 19/5`