Latest Book Aptitude Question SOLUTION: Please help me with a step by step process for solving linear equations. My problem is: x + y = 4 x - y = 5 I don\\\'t know what the first step should be.

• Placement Papers
• /
• Book
• /
• Algebra

Book Question Papers:

(#M40034369) BOOK question Keep an EYE

Please help me with a step by step process for solving linear equations. My problem is:
x + y = 4
x - y = 5
I don\'t know what the first step should be.

Asked In Book (10 years ago)

Unsolved Read Solution (1)

Is this Puzzle helpful?   (7)   (0) Submit Your Solution Algebra

Read Solution (1) :

Saraswathy  (10 years ago)

x + y = 4 ---->(1)
x - y = 5 ---->(2)

you can solve it by many methods... one among them is substitution method...

Just find out d value of any variable (x or y)

Am finding value for x
from eq (1)

x + y = 4
x = 4 - y --->(3)

now sub x=4-y in eq (2)

x - y = 5
4 - y - y = 5
4 - 2y = 5
-2y = 5-4
y=-1/2

now sub y=-1/2 in any eq (1) or (2) to calculate x value

x + y = 4
x + (-1/2) = 4
x =4+1/2
x= 9/2

So the values are x = 9/2 , y= -1/2

You can also solve this by elimination or graphing method

Is this solution Helpfull? Yes (12) | No   

Please Login to Read Solution.