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aliina [53]
4 years ago
8

15 POINTS easy and will give BRAINLY a THANKS and 5 STARS

Mathematics
2 answers:
PSYCHO15rus [73]4 years ago
8 0

1) Covert both equations into a similar form. (In order to add equations, they need to be in the same form)

Since the first equation is written in a solvable form we need to convert the second one.

y=-4x-3

+3 +3

y+3=-4x or -4x = y+3



2) Prepare to add both equations.

   -4x = y + 3  

+ -4x = y + 3                  

The goal of this method is to eliminate one of the variables. In order to eliminate ( for instance ) the "x" we need the x's to add to 0.

In order to do that, we need to multiply one of the equations by a negative one.

y - 4x = 3            y - 4x = 3

-1 (y - 4x = 3 )   - y +4x = -3

3) Add.


y - 4x = 3

-y +4x = -3

_________

0= 0


Since both sides equal each other, there are infinitely many solutions,

Hope this helped :)





4vir4ik [10]4 years ago
7 0

Use DESMOS and then take the points that are given and then plug them into your equations to show your work.

Desmos helps all equation problems that you need solved because it not only solves it, but also has it graphed with marked points.

It helped me through highschool.


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Find the volume of the cube in centimeters3<br> While the cm is 5
Kaylis [27]

Answer:

125cm^3

Step-by-step explanation:

SO the formula for volume of a cube is

V=a^3

so just plug 5 in and you get

5^3

5*5*5= 125

Hope this helps

6 0
3 years ago
As a salesperson at Roaring Waves Beach Supplies, Carissa receives a monthly base pay plus commission on all that she sells. If
babymother [125]

y = her salary,
m = rate of commission,
x = amount of merchandise sold 
b = monthly base pay 

 sets of data to calculate the formula
(500, 405) and (900, 489)

use the slope formula to find m:
(489 - 405) / (900 - 500)
m= 84 / 400 = 0.21  (21% commission) 

find the base pay by substituting known values for x,y, and m, then solve for b: 
 405 = (0.21)(500) + b 
 405 = 105 + b
b = 300

now we know the equation for her salary is:
y = 0.21x + 300

To find the salary when she sells $1,700 worth of merchandise, put 1700 for x and solve for y:
y = 0.21(1700) + 300 = 657

8 0
3 years ago
The countries population in 1991 was 231 million . In 1999 it’s was 233 million. estimate the population in 2003 used The expone
liraira [26]

Answer:

The population in 2003 was 234  million

Step-by-step explanation:

In order to calculate the population in 2003 we would have to use the The exponential growth formula as follows:

p(y)=ir^t

According to the given data:

p(y)=233 million

i=231 million

t =1999-1991

Therefore, 233 million=231 million r^(1999-1991)

(233 million/231 million)^(1/8)=r

p(y)=231 million(233 million/231 million)^((y-1991)/8)  

Therefore, in 2003   p(2003)=231 million(233 million/231 million)^((2003-1991)/8)

p(2003)=231 million(233 million/231 million)^(1.5)

p(2003)=234  million

The population in 2003 was 234  million

7 0
4 years ago
From a ship, the angle of elevation of a point, A, at the top of a cliff is 21°. After the ship has sailed 2,500 feet directly t
fredd [130]

Answer:

10701.97 feet.

Step-by-step explanation:

Refer the attached figure

The angle of elevation of a point, A, at the top of a cliff is 21° i.e. ∠ACB = 21°

The ship has sailed 2,500 feet directly toward the foot of the cliff i.e. CD = 2500 feet.

Then the angle of elevation becomes 47° i.e.∠ADB = 47°

Let BD be x

So, BC = BD+DC=x+2500

Let the height of the cliff be h feet.

In ΔABD

We will use trigonometric ratios

tan\theta = \frac{Perpendicular}{Base}

tan47^{\circ} = \frac{AB}{BD}

1.072= \frac{h}{x}

1.072x=h    ---a

In ΔABC

We will use trigonometric ratios

tan\theta = \frac{Perpendicular}{Base}

tan21^{\circ} = \frac{AB}{BC}

0.869 = \frac{h}{x+2500}

0.869(x+2500) =h

0.869x+2172.5 =h   -----b

Equate a and b

0.869x+2172.5 =1.072x

2172.5 =1.072x-0.869x

2172.5 =0.203x

\frac{2172.5}{0.203}=x

10701.97=x

Thus the height of the cliff is 10701.97 feet.

4 0
3 years ago
If I worked 8 hours and 49 minutes but my paycheck was only 97.17$ what was my hourly wage.
ruslelena [56]

Answer:

11.021$

Step-by-step explanation:

49min to hr=49/60=0.816

now total worked hrs =8hr +0.816hr=8.166hr

now 1hr wage =97.17$/total hr(8.166)=11.021$

7 0
3 years ago
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