Question

solve the following pair of linear equations by cross-multiplication method: 8x+2y=9
3x+2y=4.

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Answer 1

Answer:

8x+2y=9___(1)×2

3x+2y=4___(2)×2

_______

16x+4y=18

6x+4y=8

________

10x=10

x=1

from equation (1)

8+2y=9

2y=1

y=1/2

Answer 2

Step-by-step explanation:

solve the following pair of linear equation by substitution method:- 1, 3x-y=3; 9x-3y=9.

Answers

Hey there !!

Elimination by substitution :-

9x-3y=9 -------> [ 1 ]

3x - y = 3 ------> [ 2 ]

3x = 3 + y

x = [3 + y]/ 3

Put this value in equation [1 ]

9 × { [3 + y]/ 3 } - 3y = 9

[27+9 y ] / 3 - 3y = 9

9 [ 3 + 1 y ] / 3 = 9

3 [ 3 + 1 y ] = 9

9 + 3y = 9

3y = 9 - 9

3y = 0

y = 0

x = y + 3 / 3

= 0 + 3 / 3

= 1

Hence ,

x = 1 , y = 0

Understand in this question