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WITCHER [35]
1 year ago
9

I need help asap please

Mathematics
1 answer:
SCORPION-xisa [38]1 year ago
3 0

Answer:  (2, 3)  (3, 6)  and (6, 3)

 

Step-by-step explanation:

 i think those are it i dont really know for shure

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−4x+7y+5=0<br> x−3y=−5<br> ​ <br><br> How many solutions does the system have?
xeze [42]

   

Solution:  

Using Substitution Method:

-4x+7y=-5   (Equation 1)

x-3y=-5       (Equation 2)

get the value of x from Equation 2

x=3y-5     (Equation 3)  

Put the value of x from Equation 3 in Equation 1

-4(3y-5)+7y=-5

-4(3y)+20+7y=-5

-12y+7y=-5-20

-5y=-25

Negative sign on both sides cancels each other

y=25/5

y=5

Putting value of y in equation 3

x=3(5)-5

x=15-5

x=10

Therefore,   [x,y]=[10,5]

Using Elimination Method

-4x+7y=-5   (Equation 1)

x-3y=-5       (Equation 2)

Multiply equation 2 with -4 in order to eliminate the x term

-4(x-3y)=-5*4

-4x+12y=20     (Equation 3)

Adding Equation 1 and 3

-4x+7y=-5    

-4x+12y=20    

+    -     = -   (Change Of Sign with x and y terms)

-----------------

0x-5y = -25

-5y=-25

y=5  

Substituting y’s value is Equation 1

-4x+7(5)=-5

-4x+35=-5

-4x=-40

Cancellation of negative sign on both sides

x=40/4

x=10

[x,y]=[10,5]

3 0
3 years ago
Trinh is serving 112 people cake , 5/8ths are getting chocolate how many people will get carrot ?
Novay_Z [31]
Hey! 

If 112 people are getting cake and 5/8 are getting chocolate, that means the remaining will get chocolate.

8/8 - 5/8 = 3/8

3/8 are getting chocolate. You have to find 3/8 of 112.

3/8 × 112 = 336/8 = 42

42 people are getting carrot cake

:)
5 0
3 years ago
Evaluate the following expression using the values given: (1 point)
jolli1 [7]
3(-2) - 1 - 3(-2) = -1
5 0
3 years ago
An object falls 16 t 2 16t2 feet in t t seconds. You drop a rock from a bridge that is 75 feet above the water. Will the rock hi
GuDViN [60]

Answer:

No it is still 11 feet from the water at 2 seconds

2.1651 seconds  is when it will hit the water

Step-by-step explanation:

h(t) = -16 t^2 +75

This is the formula  for the distance

The -16t^2 is due to gravity and the 75 is the height above the bridge

We want to know the height a t =2

h(2) = -16 (2)^2 +75

h(2) =-64 +75

h(2) = 11

The rock will be 11 ft above the water

When will the rock hit the water

h = 0

0 = -16 t^2 +75

Subtract 75 from each side

-75 = -16t^2 +75-75

-75 = -16t^2

Divide by -16

-75/-16 =  -16t^2 /-16

75/16 = t^2

Take the square root of each side.  We only take the positive square root since time must be positive

sqrt(75/16) =t

5/4 sqrt(3) = t

2.1651 seconds = t


4 0
3 years ago
Lake Mead contains approximately 28,945,000 acre feet of water and there are about 326,099 gallons in 1 acre-foot. The approxima
kherson [118]

Answer:

12

Step-by-step explanation:

Let x be the number of gallons of water in lake Mead.

Given that  there is 326099 gallons in 1 acre-foot, we calculate Mead's gallons as:

1 acrefoot=326099g\\28945000acrefoot=x\\\\x=\frac{28945000acrefoot\times326099g}{1acrefoot}\\\\x=9.4\times 10^{12} \ gallons

We now equate x to 9.4\times10^a;

9.4\times 10^a=9.4\times 10^{12}\\\\a=12

Hence, a=12

6 0
3 years ago
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