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The pair 12/x + 18/y = 7 and 9/x - 12/y = 1 has a… | StemPy Lab
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The pair 12/x + 18/y = 7 and 9/x - 12/y = 1 has a solution. What is xy?
Mathematics
Hard
High School (9–10)
General
Algebra › Pairs of Linear Equations
Olympiad
SAT
Created by
StemPy Lab
The pair
12
x
+
18
y
=
7
\dfrac{12}{x} + \dfrac{18}{y} = 7
x
12
+
y
18
=
7
and
9
x
−
12
y
=
1
\dfrac{9}{x} - \dfrac{12}{y} = 1
x
9
−
y
12
=
1
has a solution. What is
x
y
xy
x
y
?
18
18
18
9
9
9
6
6
6
3
3
3
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