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Tpy6a [65]
3 years ago
7

The solution of the equation...and how to explain the answer

Mathematics
2 answers:
sashaice [31]3 years ago
8 0

Answer:

x = -2.

Step-by-step explanation:

3x + 7 = 1

3x + 7 - 7 = 1 - 7

3x + 0 = -6

x = -6/3

x = -2.

babymother [125]3 years ago
5 0

Answer:

x=-2

Step-by-step explanation:

1st:

Subtract 7 to both sides, so..

3x+7=1

    -7 -7

2nd:

3x=-6

3rd, Divide 3 to both sides:

3x=-6

_       _

3     3

4th:

x=-6/3

5th:

your answer is, x=-2

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Read 2 more answers
two brothers marco and fernando are training for a marathon marco runs at a rate of 6miles per hor. Fernando funs at at a rate o
satela [25.4K]
We know that
speed=distance/time
solve for time
time=distance/speed

in this problem
<span>Marco runs at a rate of 6 miles per hour. 
</span><span>Fernando funs at a rate of 7.2 miles per hour
Difference=7.2-6=1.2 miles/hour
so
speed=1.2 miles/hour
distance=0.3 miles
time=?
</span>time=distance/speed-----> 0.3/1.2-----> 0.25 hour-----> 0.25*60=15 minutes
<span>
the answer is
0.25 hour (15 minutes)

Alternative Method
Let 
x---------> Fernando's distance when Marco is 0.3 miles apart

</span>Fernando funs at a rate of 7.2 miles per hour
<span>for distance =x
time=x/7.2------> equation 1

</span>Marco runs at a rate of 6 miles per hour. 
for distance=x-0.30
time=(x-0.30)/6------> equation 2

equate equation 1 and equation 2
 7.2*(x-0.3)=6x-----> 7.2x-2.16=6x
7.2x-6x=2.16------> x=2.16/1.2-------> x=1.8 miles

time=x/7.2-----1.8/7.2=0.25 hour
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Y=3/4x+1/4 if you take a close look at where the line crosses over the y-axis.
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