Question

the solution of equations 3x+4y=10 and x-y =1 is​

Answer 1

Answer:

3x+4y=10-------1

x-y=1------------2

now,

1 (3x+4y=10)

3x+4y=10------------3

3 (x-y=1)

3x-3y=3---------------4

now, solving 4 from 3

3x+4y=10

3x-3y=3 (- = + , + = -)

0+7y= 7

y=7

7

y = 1

therefore put the value of y in equation 3,

3x+4y=10

3x+4 (1)=10

3x +4=10

3x=10-4

3x=6

x=6

3

x=2

Answer 2

Answer:

x=10/7

y=3/7

from second equation we have value of y = x-1

now we will put in first equation of that is 3x+4(x-1)=10

we have ,

7x-4=10

x=10/7

and y= 10/7 -1

that is y= 3/7