Question

solve by cross multiplication method : 2x + 3y = 7 ; 3x + 4y = 10​

Answer 1

Answer:

x = 2

y = 1

Step-by-step explanation:

$2x + 3y = 7 - - - - (1)\\ 3x + 4y = 10 - - - - (2)$

multiply (1) with 3 ,

$6x + 9y = 21$

multiply (2) with 2 ,

$6x + 8y = 20$

6x + 9y = 21

6x + 8y = 20 -

y = 1

Substitute y in (1)

2x + 3× 1 = 7

2x + 3= 7

2x = 7-3

2x = 4

x = 2

2 × 2 + 3× 1= 7---------(1)

4+3 = 7

3×2 + 4×1= 10

6+4= 10---------------(2)