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butalik [34]
4 years ago
11

Michael bought 2 notebooks and 1 pen for 7 dollars. Rick bought one notebook and 5 pens for 8 dollars

Mathematics
1 answer:
tiny-mole [99]4 years ago
6 0
Notebooks=x
pens=y
7=2x+y
8=x+5y ==> x=8-5y
substitute into the first equation
7=2(8-5y)+y
7=16-10y+y
7=16-9y
-9=-9y
y=1
now substitute y to find x
x=8-5y
x=8-5(1)
x=8-5
x=3
assuming you want amount of money for each item, a notebook is $3, and a pen is $1.
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5
x
2
−
3
x
3
)
Distribute the Negative Sign:
=
8
x
3
−
x
+
−
1
(
10
x
−
5
x
2
−
3
x
3
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=
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x
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−
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−
1
(
10
x
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(
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x
3
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8
x
3
+
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x
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10
x
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5
x
2
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3
x
3
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8
x
3
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−
x
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−
10
x
+
5
x
2
+
3
x
3
=
(
8
x
3
+
3
x
3
)
+
(
5
x
2
)
+
(
−
x
+
−
10
x
)
=
11
x
3
+
5
x
2
+
−
11
x
Answer:
=
11
x
3
+
5
x
2
−
11
x


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