Question

Solve 0.4x + 3y =1.2 ; 7x - 2y = 17/6 by elimination method and substitution method?

Answer 1

Given: 0.4x + 3y =1.2 ; 7x - 2y = 17/6

To find: Solve by elimination method and substitution method?

Solution:

• Now we have two equations:  0.4x + 3y =1.2 ; 7x - 2y = 17/6

• Considering first equation,  0.4x + 3y =1.2 multiplying it by 10, we get:

                  4x + 30y = 12.

• Now multiply first equation by 7 and second equation by 4.

• We get:

                 28x + 210y = 84 and 28x - 8y = 34/3

• Now subtracting second equation from first, we get:

                 28x + 210y - 28x + 8y  = 84 - 34/3

                 218y = 218 / 3

                 y = 1/3

• Now putting y = 1/3 in second equation, we get:

                 7x - 2(1/3) = 17/6

                 7x = 17/6 + 2/3

                 7x = 17 + 4 / 6

                 7x = 21/6

                 x = 3/6

                 x = 1/2

Answer:

           So the value of x is 1/2 and y is 1/3.

Answer 2

plz solve this only in substitution method and upload

thankyou