rebecca1233
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
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annas
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A) 4x+4y=-4(multi eq 1 with 4)
4x+4y=-4
subtract both eq
we'll get 0 = 0
rebecca1233
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thats a right ?
rebecca1233
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wait thats the 4th one so A= 4
rebecca1233
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or a = 2
annas
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B) 2x - 8y = -16(multi eq1 with 2)
2x - 3y = -16
subtracting both eqs
-5y = 0
y=0
x= -8
(-8,0)
annas
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A system of eq has no solution
rebecca1233
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so A= is the 4th one like i said
annas
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yes
rebecca1233
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what bout the other two
annas
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can you solve the rest ???
rebecca1233
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Which system has (1, 3) as the solution?
annas
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B system of eq has solution set = (-8,0)
rebecca1233
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E) x - y = -2
3x - y = 0
rebecca1233
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that is correct right ?
annas
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wait
annas
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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)
rebecca1233
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Thought so..
rebecca1233
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is c the last option
annas
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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)
rebecca1233
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so i am right :)
annas
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yes :)
rebecca1233
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then D is the second one
annas
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D) 4x + 6y = -12
4x + 6y = 18(multi by 2)
subtract both eqs
0 = -30
so D has infinite solutions