Question 1.1
1.1.1
1.1.1.1 Linear Equation:
Adding +18 to both sides of equation, we get:
Now, dividing both sides by 6, we get:
Hence, the solution of this equation is
1.1.1.2 To solve the linear equation ( )
Pseudocode:
DO
INPUT ( )
(( ) ) ( )
(( ) ) ( )
OUTPUT
ENDDO
Analysing the Pseudocode:
( )
Subtract 35 from both sides:
Subtract 6 from both sides:
Divide by ( ) on both sides:
Algebraic Method (solved by using Elimination Method):
eq.1
eq.2
Multiply eq.2 thoroughly by 2 to get the coefficients of the same;
eq.3
eq.2
Subtract eq.3 and eq.2 to eliminate and solve for
On dividing both sides by 7, we get
Substituting this value of in eq.1 and solve for , we get
Subtract 4 from both sides:
Hence, we obtain a unique solution to these simultaneous equations, i.e. at
Graphical Method
Plotting the set of simultaneous linear equations below:
can say that the solution to these equations: ( ) ( ).
1.1.2
Plotting the quadratic equation: ( )
( ) .
Line of Symmetry
Root Root
Minima
1.1.2.1
Concluding from the above graph of equation, the minimum point is:
( ) ( )
1.1.2.2
The Line of Symmetry (or Axis of Symmetry) of a parabola is a line through vertex
which divides the parabola into two equal halves. Here, equation of Line of Symmetry
is:
NOTE: We can also check using algebraic method:
( )
1.1.2.3
The roots (value of for which corresponding value of ( ) equals zero) of
given quadratic equation are real and distinct. From graph, they are:
1.1.2.4
Using the quadratic formula:
√
For given quadratic equation, the respective coefficients are:
Substituting values of a, b and c in quadratic formula, we get:
√ ( )( )
( )
√
Therefore, 1 and 2
Hence, the roots of given quadratic equation are:
The equation of a straight line is written as:
Here, m = slope or gradient =
b = the Y-intercept (where the line crosses the Y-Axis)
x & y are the respective variable coordinates
For Line A:
P1 = (-2, 1)
P2 = (0, 5)
Consider 2 points P1[(x1,y1): (-2,1)] and P2[(x2,y2): (0,5)]. We can write slope:
( )
Also, Y-intercept:
Hence the equation can be written as: ( ) ( )
Answer ..... (Subtract ‘y’ on both sides)
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