Question

Find the value of x and y by substi
tution method
2x-3y=13
7x-2y=20​

Answer 1

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Answer 2

Hey buddy
here's the answer

2x - 3y = 13 --eqn. 1
7x - 2y = 20 --eqn.2

from eqn, 1 , we get ,
2x = 13 + 3y
x = 13/2 + 3y/2 --eqn. 3

putting value of x in eqn.2, we get,

7 ( 13/2 + 3y/2 ) - 2y = 20
91/2 + 21y/2 - 2y = 20
91/2 + 21y/2 - 4y/2 = 20
91/2 + 17y/2 = 20
17y/2 = 20 - 91/2
17y/2 = 40/2 - 91/2
17y = 40 - 91
17y = -51
y = -51/17
y = -3 --eqn.4

putting value of y in eqn.3, we get,

x = 13/2 - 9/2
x = 4/2
x = 2

therefore,

x = 2
y = -3






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