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Jaylyn Donaldson
Mathematics
1 October, 16:24
Solve the system of equation
y=2X^2-3
y=3X-1
+3
Answers (
1
)
Ernest Moody
1 October, 16:28
0
Since they both equal y
2x^2-3=y=3x-1
2x^2-3=3x-1
subtract 3x from both sides and add 1
2x^2-3x-2=0
factor
(x-2) (2x+1) = 0
set each to zero
x-2=0
x=2
2x+1=0
2x=-1
x=-1/2
subsitute
y=3x-1
y=3 (2) - 1
y=3 (-1/2) - 1
y=6-1
y=-3/2-2/2
y=5
y=-5/2
so solutions are
x=2 and y=5 or
x=-1/2 and y=-5/2
(x, y)
(2,5) or (-1/2, - 5/2)
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