9/3 is already made a fraction.
Why?
Because it is not a whole numer.
Well, this improper fraction can be simplified.
<u>9 </u> ÷ 3<u>
</u>3 ÷ 3
= 1.
<u />
Answer:
Look at the equations:
y
=
−
9
x
−
21
and
y
=
5
x
+
7
Because both equations equal (y), they both equal the same.
If an equations says "
y
=
−
9
x
−
21
" , that means we can replace (y) with
−
9
x
−
21
.
Therefore when i take the equation:
y
=
5
x
+
7
, we can replace (y) to get:
−
9
x
−
21
=
5
x
+
7
Now isolate (x):
−
9
x
−
21
=
5
x
+
7
⇔
−
21
=
14
x
+
7
⇔
−
28
=
14
x
⇔
x
=
−
2
The two values are positive 9 and negative 9
D is the answer hope this helps