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Byju's Answer
Standard X
Mathematics
Representing Linear Equations for a Word Problem
5 books and 7...
Question
5 books and 7 pens together cost rs.79 where as 7 books and 5 pens together cost rs.77.Find the cost of 1 book and 2 pens.
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Solution
Let
x
be
the
cost
of
1
book
and
y
be
the
cost
of
1
pen
.
According
to
the
conditions
,
5
x
+
7
y
=
79
.
.
.
.
.
.
.
1
7
x
+
5
y
=
77
.
.
.
.
.
.
.
2
adding
1
and
2
,
we
get
12
x
+
12
y
=
156
⇒
x
+
y
=
13
.
.
.
.
.
.
.
.
3
Subtracting
2
from
1
,
we
get
-
2
x
+
2
y
=
2
⇒
-
x
+
y
=
1
.
.
.
.
.
.
.
4
Adding
3
and
4
,
we
get
2
y
=
14
⇒
y
=
7
From
1
,
we
get
x
=
6
So
,
cost
of
1
book
=
Rs
6
Cost
of
2
pens
=
2
×
7
=
Rs
14
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