Question

X + Y = 5 and 5x -2y =4 by substitution method​

Answer 1

Step-by-step explanation:

4x+9y=5

⟹4x=5−9y

⟹x=

4

5−9y

Substituting x=

4

5−9y

in

−5x+3y=8, we get,

−5(

4

5−9y

)+3y=8

⟹

4

−25+45y+12y

=8

⟹−25+45y+12y=8×4

⟹−25+57y=32

⟹57y=57

⟹y=1

Substituting y=1in x=

4

5−9y

x=

4

5−9(1)

⟹x=

4

−4

⟹x=−1

∴x=−1,y=1

Answer 2

Answer:

$x + y = 5 \\ x = 5 - y$

substitute in eqn2

$5(5 - y) - 2y = 4 \\ 25 - 5y - 2y = 4 \\ - 7y = - 21 \\ y = 3$

$x = 5 - 3 = 2$

x=2 and. y =3

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