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NCERT Exemplar Solutions Class 8 Mathematics Solutions for Linear Equations in One Variable - Exercise in Chapter 4 - Linear Equations in One Variable
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9x – _________ = –21 has the solution (–2)
Answer:
9x – 3 = –21 has the solution (–2)
In the question it is given that, x = -2
Then, let us assume the missing number be y
(9 × (-2)) – y = -21
-18 – y = -21
-
y = -21 + 18
-
y = - 3
Y = 3
Video transcript
"hello students i am rita your math
leader tutor
and the today's question is 9 x minus
dash is equal to minus 21
has the solution minus 2
so in this question the value of x is
given to us minus 2 because solution is
given it means the value of
x is given to us minus 2 and we have to
find
this missing number we let the missing
number
is equal to y we let it
missing number is equal to y so the
equation becomes
9 x minus y is equal to
minus 21 and we know the value of
x is equal to minus 2 so we put the
value of x
in place of x we put the value of
x that is minus 2 minus y is equal to
minus 21
so we got minus 18 minus y is equal to
minus
21 minus y is equal to minus 21 when
minus 18 goes to the right hand side it
becomes
plus so the minus y is equal to minus
3 minus minus cancel each other so the
answer
y is equal to 3 so the missing number is
3 so the answer is 3 this is our answer
so the answer is 3 this is our answer i
hope you like this video
so please subscribe video for more
updates and to comment your
questions thank you"
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