Answer:
<h2>(5,4)</h2>
Step-by-step explanation:

Answer:
>
=
>
= 
>
= 
>
= 
Step-by-step explanation:
We have to expand the powers of each of them:
>
= 
= 
=
>
= 
= 
>
= 
= 
>
= 
= 
Answer:
A pack of pencil' price=$8
Price went up=$12
increasing percentage = change/original x100
= (12 -8)/8 x100
=4/8 x100
=50%
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
19/25 is the answer
hope i helped!