Solve, using linear combination.

3x + y = 4
2x + y = 5

(Points : 4)
(–1, 7)
(0, 4)
(–3, 12)
(–3, 13)

Question

Solve, using linear combination.

3x + y = 4
2x + y = 5

(Points : 4)
       (–1, 7)
       (0, 4)
       (–3, 12)
       (–3, 13)

anonymous · Answer

3x+y=4 
2x+y=5 [-] 
------------ 
x = -1 
put x= -1 in 3x+y=4 
3*-1+y=4 
-3+y=4 
y=4+3 
y=7 
now put x= -1 and and y=7 in 2 equations to recheck the answers as they are correct or not 
put x = -1 and y=7 in 3x+y=4 
3[-1]+7=4 
-3+7=4 
4=4 
now put those values in 2x+y=5 
2[-1]+7=5 
-2+7=5 
5=5 

so the values of x and y are 
x = - 1 
y = 7

anonymous · Answer

Your answer is A. @glamourglory.

anonymous · Answer

thank you guys

abhisar · Answer

Um.....i can teach you an easier way :3

anonymous · Answer

can you thank you