Question

5x=7y-21, 21x-9y=0 in substitution method​

Answer 1

Answer:

Answer:

The value of x=3 and y=1 is the solution.

Step-by-step explanation:

Given : Equations

To solve : The given equations by substitution?

Solution :

Let ......[1]

.......[2]

Now, solving [1] and [2] by substitution method,

Substitute the value of x from [1] in [2]

Substitute the value of y=1 in [1]

Therefore, The value of x=3 and y=1

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

5x=7y-21

x=7y-21/5....(1)

21x-9y=0..........(from(1))

21(7y-21/5)-9y=0

147y-441/5=9y

147y-441=45y

45y-147y=-441

-102y=-441

y=441/102

y=4.2

x=7y-21/5

x=7(4.2)-21/5

x=29.4-21/5

x=8.4/5

x=1.68

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