Systems of Polynomial Equations
PSAT Math · Flashcards
PSAT MATH · FLASHCARDS
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QUESTION
Identify the best first step to solve
y
=
2
x
+
1
y=2x+1
y
=
2
x
+
1
and
x
2
+
y
2
=
5
x^2+y^2=5
x
2
+
y
2
=
5
using substitution.
QUESTION
What should you do after finding possible
x
x
x
-values from substitution in a system?
QUESTION
What is the elimination step when two equations are equal to
y
y
y
, such as
y
=
f
(
x
)
y=f(x)
y
=
f
(
x
)
and
y
=
g
(
x
)
y=g(x)
y
=
g
(
x
)
?
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ANSWER
Subtract to get
f
(
x
)
−
g
(
x
)
=
0
f(x)-g(x)=0
f
(
x
)
−
g
(
x
)
=
0
. This creates a single equation to find where curves intersect.
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