the sum of -9 and 15 is ? solution
Answers
Answered by
8
Answer:
15 and –9 6 is the answer
Answered by
6
See a solution process below:
Explanation:
First, let's call the two numbers:
n
and
m
Then we can write two equations:
n
+
m
=
15
n
m
=
50
Step 1) Solve the first equation for
n
:
n
+
m
−
m
=
15
−
m
n
+
0
=
15
−
m
n
=
15
−
m
Step 2) Substitute
(
15
−
m
)
for
n
in the second equation and solve for
m
:
n
m
=
50
becomes:
(
15
−
m
)
m
=
50
15
m
−
m
2
=
50
−
m
2
+
15
m
=
50
−
m
2
+
15
m
−
50
=
50
−
50
−
m
2
+
15
m
−
50
=
0
−
1
(
−
m
2
+
15
m
−
50
)
=
−
1
⋅
0
m
2
−
15
m
+
50
=
0
(
m
−
10
)
(
m
−
5
)
=
0
Step 3) We can now solve each term on the left for
0
m
−
10
=
0
m
−
10
+
10
=
0
+
10
m
−
0
=
10
m
=
10
Or
m
−
5
=
0
m
−
5
+
5
=
0
+
5
m
−
0
=
5
m
=
5
m
=
5
or
m
=
10
Therefore:
n
=
10
or
n
=
5
There two numbers are:
5
and
10
5
+
10
=
15
5
×
10
=
50
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