Question

substitute method x+y=4, 3x+11y=4
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Answer 1

Answer:

$x + y = 4$

let it be equation 1

$3x + 11y = 4$

let it be equation 2

$from \: eq1 \:$

$x = 4 - y$

let it be equation 3

Substitute equation 3 in equation 2

$3( 4 - y) + 11y = 4$

$12 - 3y + 11y = 4$

$12 - 8y = 4$

$4(3 - 2y) = 4$

$3 - 2y = 1$

$- 2y = - 2$

$y = 1$

Substitute value of y in equation 3

$x = 4 - y = 4 - 1 = 3$

$x = 3$

Answer 2

Answer:

X+Y=4

X=4-Y-----------(1)

PUTTING THE VAlue of X in equation 1

3x+11y=4

3(4-y)+11y= 4

12-3y+11y=4

12+8y=4

8y=4-12

8y=-8

y=-1

PUTTING the value of y in equation (1)

X+Y=4

X+(-1)=4

x=5

Step-by-step explanation:

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