Question

If 3x+4y=2 and 5x-3y=26 find the value of x+2y

Answer 1

Answer:

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(3x+4y=2)*3

9x+12y=6-------1

(5x-3y=26)*4

20x-12y=104------2

add 2 and 1

20x-12y=104

+9x+12y=6

29x=110

x=110/29=3.79

put x value in 1

9*3.79+12y=6

12y=6 - 34.11

y=-28.11/12 = -2.34

THEREFORE;

x+2y=3.79+2*-2.34

       =3.79 - 4.68

x+2y= -0.89