What’s the property of 4+9=9+4

Mathematics

1 answer:

Ilya [14]3 years ago

5 0

Answer:

From change of places of summands the sum does not change.

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Solve the following systems of equations algebraically. Write your answer in the form of (x, y).

Ne4ueva [31]

Let's solve your system by substitution.
y
=
3
x
+
5
;
y
=
x
+
19

Step: Solve
y
=
3
x
+
5
for y:
y
=
3
x
+
5

Step: Substitute
3
x
+
5
for
y
in
y
=
x
+
19
:
y
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x
+
19
3
x
+
5
=
x
+
19
3
x
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5
+
−
x
=
x
+
19
+
−
x
(Add -x to both sides)
2
x
+
5
=
19
2
x
+
5
+
−
5
=
19
+
−
5
(Add -5 to both sides)
2
x
=
14
2
x
2
=
14
2
(Divide both sides by 2)
x
=
7

Step: Substitute
7
for
x
in
y
=
3
x
+
5
:
y
=
3
x
+
5
y
=
(
3
)
(
7
)
+
5
y
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Answer:
x
=
7
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Easy peasy

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times both sides by 2 for everybody
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add 4 to both sides for left one and minus 5 from both sides for right
x=10 and y=5

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