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
Answer:
Distance=3.1 miles
Step-by-step explanation:
Step 1: Determine how many meters make a mile
The conversion rate expression is;
1 mile=1.60934 kilometers
Step 2: Convert 5 km to miles
Using the expression below;
Distance in miles=distance in kilometers/1.60934
where;
distance in kilometers=5 km
replacing;
Distance in miles=5/1.60934
Distance in miles=3.10686 miles
Step 3: Round off to nearest tenth of a mile
Nearest tenth of a mile=1/10=0.1 , the same as rounding of to the nearest 1 decimal place
Distance 3.10686 miles rounded off to 1 decimal place=3.1 miles
Distance=3.1 miles
Answer: r= -1000
Step-by-step explanation:
Solve for r by simplifying both sides of the equation, then isolating the variable