3x+7y=11
x-y=0
solve by using elimination and substitution method

x =

y =

Step-by-step explanation:

By elimination method

3x +7y = 11 ......eqn(1)

x - y = 0 .......eqn(2)

Mulitplying equation (2) with 7 we get:

7x - 7y = 0 ..........eqn(3).

Adding equation (1) and (3), we get:

10x = 11

x =

Now plugging the value of x in equation (2) we get:

y =  

By substitution method

x - y = 0

x = y.............eqn(4)

3x + 7y = 11........eqn(5)

Substituting the value of x in  equation (5) we get:

y =

Now plugging the value of y in equation (3) we get:

x = .

linear

step-by-step explanation:

18.75 gallons

step-by-step explanation: