Question

2x+3y=21;3x-3y=4 find the value of x and y​

Answer 1

Step-by-step explanation:

2x+3y-21=0 ----(1)

3x-3y-4=0-----(2)

from substitution method,

from equation (1),

2x+3y=21

2x=21-3y

x=21-3y/2-----(3)

substituting this value of x in equation (2),

3(21-3y/2)-3y-4=0

63-9y-6y-8/2=0

63-9y-6y-8=0×2

55-15y=0

-15y=-55

y= -55/-15

y=11/3

putting y=11/3 in equation (3),

x=21-3×11/3 /2

x=21-11/2

x=11/2