SOLUTION: Solve by the addition method: 6x-3y=15 8x-4y=20 A. (4, 3) B. Dependent. The solutions satisfy the equation C. (1, –3) D. (–2, –9) E. (7, 9)

Algebra ->  Expressions-with-variables -> SOLUTION: Solve by the addition method: 6x-3y=15 8x-4y=20 A. (4, 3) B. Dependent. The solutions satisfy the equation C. (1, –3) D. (–2, –9) E. (7, 9)      Log On


   

Question 1053317: Solve by the addition method:
6x-3y=15
8x-4y=20

A.
(4, 3)

B.
Dependent. The solutions satisfy the equation

C.
(1, –3)

D.
(–2, –9)

E.
(7, 9)
Found 2 solutions by addingup, josgarithmetic:
Answer by addingup(3677) About Me  (Show Source):
You can put this solution on YOUR website!
addition method: good luck with that.
substitution method:
6x-3y=15 isolate the x on the left:
x = (y+5)/2
Sow substitute in the other equation
8x-4y = 20
[8(y+5/2)]-4y = 20
x=1/2(y+5)

Answer by josgarithmetic(39621) About Me  (Show Source):
You can put this solution on YOUR website!
Do you mean "Elimination" method?


Make equivalent system:

system%284%286x-3y%29=4%2A15%2C3%288x-4y%29=3%2A20%29

system%2824x-12y=60%2C24x-12y=60%29

BUT these are the same equation.