Question

Write the value of Dy for the
simultaneous equation 3X-Y=7 ; X+4Y =11​

Answer 1

Answer:

Given,

3x - y = 7  ---  1

x + 4y = 11 ---  2

Now,

Take equation 1,

3x = 7 + y

x = 7 + y/3 ---- 3

Substitute equation 3 into equation 2

x + 4y = 11

(7 + y/3) + 4y = 11

y/3 + 4y = 11 - 7 = 4

y + 4y = 4 x 3 = 12

5y = 12

y = 12/5

y = 2.4

therefore, the value of y is 2.4!

Hope it helps~