Question

Solve, using linear combination.

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

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

Answer 1

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

Answer 2

Your answer is A. @glamourglory.

Answer 3

thank you guys

Answer 4

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

Answer 5

can you thank you