3 years ago

7x+3y =-4 X-5y=-6 substitution please explain

Mathematics

1 answer:

inysia [295]3 years ago

4 0

First you have to isolate one of the equations for y=mx+b.
Then substitute the equation is made into the first equation

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You have a wire that is 38 cm long. you wish to cut it into two pieces. one piece will be bent into the shape of a square. the o

erica [24]

Circumference + perimeter =38
x = circumference of circle
find r in terms of x
2 $\pi$ r=x
r= $\frac{x}{2 \pi }$
Area= $\pi$ r^2
so..
A= $\pi$ ( $\frac{x}{2 \pi }$ )^2
= $\pi$ ( $\frac{x^{2} }{4 \pi ^{2} }$ )
= $\frac{x^{2} }{4 \pi }$

(38-x) is perimeter
then
$\frac{38-x}{4}$
( $\frac{38-x}{4}$ )^2
$\frac{x^{2} }{4 \pi }$ + ( $\frac{38-x}{4}$ )^2
then you graph it and it equals
16.716 cm the circumference of the circle

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3 years ago

How much greater is this week’s median temperature than last week’s median temperature?

Scrat [10]

Answer:

5 degrees

Step-by-step explanation:

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3 years ago

Patti has two glue sticks that are partially used . One has 1/5 left and one has 3/10 left. Which glue stick has more glue

leonid [27]

Answer:

The second glue stick

Step-by-step explanation:

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3 years ago

Read 2 more answers

A human body that is performing light work generates about 400 btus of the body heat per hour while active. if an office that is

Neporo4naja [7]

I got none of the above my answer is 1.6 BTUs/ft3. I did 400 x 8 x 3 for total BTUs = 9600 btus and the volume of the room was 20 x 30 x10 ft = 6000 cu ft so 9600/6000= 1.6 BTUs/ft3

6 0

3 years ago

Simpily 3c - 9d + 7c +5d

denpristay [2]

Answer:

4c - 4d

Step-by-step explanation:

3c - 9d + 7c + 5d

4c - 9d +5d

4c - 4d

Hope this helps!

8 0

3 years ago