3 years ago

How do I solve y=x+3 y=5x-5

Mathematics

1 answer:

Wewaii [24]3 years ago

7 0

Answer:

= -2

Step-by-step explanation:

You might be interested in

Dwayne drove 18 miles to the airport to pick up his father and then returned home. On the return trip he was able to drive an av

Nesterboy [21]

Answer:

30 mph

Step-by-step explanation:

Let d = distance (in miles)

Let t = time (in hours)

Let v = average speed driving to the airport (in mph)

⇒ v + 15 = average speed driving from the airport (in mph)

Using: distance = speed x time

$\implies t=\dfrac{d}{v}$

Create two equations for the journey to and from the airport, given that the distance one way is 18 miles:

$\implies t=\dfrac{18}{v} \ \ \textsf{and} \ \ t=\dfrac{18}{v+15}$

We are told that the total driving time is 1 hour, so the sum of these expressions equals 1 hour:

$\implies \dfrac{18}{v} +\dfrac{18}{v+15}=1$

Now all we have to do is solve the equation for v:

$\implies \dfrac{18(v+15)}{v(v+15)} +\dfrac{18v}{v(v+15)}=1$

$\implies \dfrac{18(v+15)+18v}{v(v+15)}=1$

$\implies 18(v+15)+18v=v(v+15)$

$\implies 18v+270+18v=v^2+15v$

$\implies v^2-21v-270=0$

$\implies (v-30)(v+9)=0$

$\implies v=30, v=-9$

As v is positive, v = 30 only

So the average speed driving to the airport was 30 mph

(and the average speed driving from the airport was 45 mph)

8 0

2 years ago

Read 2 more answers

F(x)=4x-3 g(x)=x^3+2x find (f-g)(4)

Roman55 [17]

((f-g)(4) means f(4) - g(4).)im pretty sure the answer -59

5 0

3 years ago

A box that measures 15 inches by 5 inches by 3 inches.

tino4ka555 [31]

Answer: cubic inches.

Step-by-step explanation: When calculating volume, all of the units must be cubed. And all of the measurements are in inches.

6 0

3 years ago

Read 2 more answers

2,550 gallons in 30 days and find the unit rate.round to the nearest hundredth if necessary

faust18 [17]

85 gallons per day is the unit rate. divide 2550 by 30

6 0

3 years ago

Two companies have made Evelyn job offers. B-Innovative, Inc., provides a one-time signing bonus of $4,100 and pays $1,095 a wee

12345 [234]

D I think the answer is and I thin 5

3 0

3 years ago

Read 2 more answers