Question

7x-y=10 9x+2y=3 solve it by substitution method​

Answer 1

Step-by-step explanation:

from the first equation we get

y=7x-10

put this value in second equation

9x+2(7x-10)=3

9x+14x-20=3

23x=23

x=1

put x value in any one of the equation

y=-3

Hope you understand

Answer 2

Step-by-step explanation:

Given -

7x - y = 10

9x + 2y = 3

To Find -

Value of x and y by substitution method

Now,

7x - y = 10

• = y = 7x - 10

Substituting the value of y on 9x + 2y = 3

= 9x + 2(7x - 10) = 3

= 9x + 14x - 20 = 3

= 23x = 23

• = x = 1

Substituting the value of x on 7x - y = 10

= 7(1) - y = 10

= 7 - 10 = y

• = y = -3

Hence,

The value of x is 1 and y is -3

Verification -

Substituting the value of x and y on 9x + 2y = 3

= 9(1) + 2(-3) = 3

= 9 - 6 = 3

= 3 = 3

LHS = RHS

And

Substituting the value of x and y on 7x - y = 10

= 7(1) - (-3) = 10

= 7 + 3 = 10

= 10 = 10

LHS = RHS

Hence,

Verified..