Question

3x+5y=4 9x-2y=7 by substitution method

Answer 1

Answer:

X= 27/26, Y= - 5/13

Step-by-step explanation:

Substitution method:

Given pair of equations,

3x-5y = 4

=> 3x = 4+5y ----(1)

and

9x-2y = 7 ----(2)

Substitute equation (1) in equation (2), we get

=> 3(4+5y)-2y = 7

=> 12+15y-2y = 7

=> 13y = 7 - 12

=> 13y = -5

=> y = -5/13

Put y value in equation (1),we get

Elimination method:

3x-5y = 4 ---(1)

9x -2y = 7 ---(2)

/* multiply equation (1) by 3 , and subtract from equation (2), we get

9x-2y = 7

9x-15y = 12

_______________

0 + 13y = -5

_______________

y = -5/13

/* Substitute y = -5/13 in equation (1) , we get

3x - 5(-5/13)=4

=> 3x +25/13 = 4

=> 3x = 4-(25/13)

=> 3x = (52-25)/13

=> x = 27/26

Therefore,.

x = 27/26, y = -5/13

Answer 2

Answer:

x= 27/26

y= -5/13

Step-by-step explanation:

Mark as brainliest and follow me