Question

Which system has (1, 3) as the solution?
Which system has infinite solutions?
Which system has (-8, 0) as the solution?
Which system has no solutions?
Which system has (-2, -2) as the solution?


A) x + y = -1
4x + 4y = -4

B) x - 4y = -8
2x - 3y = -16

C) x + y = -4
-3x + 2y = 2

D) 4x + 6y = -12
2x + 3y = 9

E) x - y = -2
3x - y = 0

Answer 1

A) 4x+4y=-4(multi eq 1 with 4)
4x+4y=-4
subtract both eq
we'll get 0 = 0

Answer 2

thats a right ?

Answer 3

wait thats the 4th one so A= 4

Answer 4

or a = 2

Answer 5

B) 2x - 8y = -16(multi eq1 with 2)
2x - 3y = -16
subtracting both eqs
-5y = 0
y=0
x= -8
(-8,0)

Answer 6

A system of eq has no solution

Answer 7

so A= is the 4th one like i said

Answer 8

yes

Answer 9

what bout the other two

Answer 10

can you solve the rest ???

Answer 11

Which system has (1, 3) as the solution?

Answer 12

B system of eq has solution set = (-8,0)

Answer 13

E) x - y = -2
3x - y = 0

Answer 14

that is correct right ?

Answer 15

wait

Answer 16

E) x - y = -2
3x - y = 0
subtracting both eqs
-2x=-2
x= 1
y=3
(1,3)
yes E has solution set (1,3)

Answer 17

Thought so..

Answer 18

is c the last option

Answer 19

C)2x +2 y = -8(multi with 2)
-3x + 2y = 2
subtract both eqs
5x=-10
x= -2
y=-2
(-2,-2)
C has solution set (-2,-2)

Answer 20

so i am right :)

Answer 21

yes :)

Answer 22

then D is the second one

Answer 23

D) 4x + 6y = -12
4x + 6y = 18(multi by 2)
subtract both eqs
0 = -30
so D has infinite solutions