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Llana [10]
3 years ago
11

Help please math ..??

Mathematics
1 answer:
astraxan [27]3 years ago
8 0

Answer:

(3, - 1)

Step-by-step explanation:

5x - 4y = -11

2x + 3y = -9

Multiply the top equation by 2 and the bottom equation by - 5 to cancel out the x's.

10x - 8y = - 22

- 10x - 15y = 45

Cancel out x's.

-8y = - 22

- 15y = 45

Add like terms.

- 23y = 23

Can't have a negative variable to flip them.

-23 = 23y

Divide.

y = - 1

Input y into one of the equations and solve for x.

2x + 3(-1) = -9

Simplify.

2x -3 = -9

Cancel out -3 by adding 3.

2x = -6

Divide.

x - -3

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The table below shows the relationship between the number of teaspoons of baking powder in a mix and the height of fudge brownie
rosijanka [135]

Answer:

Option A. y=0.28x+0.75

Step-by-step explanation:

Let

y -----> the height of fudge brownies in centimeters

x ----> teaspoons of baking powder

step 1

Find the slope

The formula to calculate the slope between two points is equal to

m=\frac{y2-y1}{x2-x1}

take the points

(5,2.15) and (6,2.43)

substitute the values

m=\frac{2.43-2.15}{6-5}

m=\frac{0.28}{1}=0.28

step 2

Find the equation of the line in point slope form

y-y1=m(x-x1)

we have

m=0.28

(x1,y1)=(5,2.15)

substitute

y-2.15=0.28(x-5)

Isolate the variable y

y-2.15=0.28x-1.4

y=0.28x-1.4+2.15

y=0.28x+0.75

6 0
3 years ago
Read 2 more answers
What fraction is equivalent to 23/30
Gala2k [10]
There are many.
46/60, 92/120, 184/240, etc.
6 0
3 years ago
Solve for 5 points, will give brainlist
Elanso [62]

Answer:

i know that the first one is not equivlent but i dont know about the others

Step-by-step explanation:

7 0
2 years ago
Plz help gotta finish before 11:59:((((
olasank [31]

Answer:

19/42

Step-by-step explanation:

multiply each fraction by the opposite denominator to get the same denominator for both 12+7=19 &6×7=42

8 0
3 years ago
A family has two cars. The first car has a fuel efficuency of 15 miles per gallon of gas and the second has a fuel efficiency of
SVEN [57.7K]

Answer:

x= 35 gallons consumed by 1st car

and y= 40  gallons consumed by 2nd car

Step-by-step explanation:

Fuel efficiency of 1st car = 15 miles per gallon

Fuel efficiency of 2nd car = 35 miles per gallon

Let x= gallons consumed by 1st car

and y= gallons consumed by 2nd car

Total gallons consumed by both cars = 75

so, we can write

x + y = 75

Miles covered by both cars = 1925 miles

and we know, Fuel efficiency of 1st car = 15 miles per gallon

Fuel efficiency of 2nd car = 35 miles per gallon

we can write the equation as

15 x + 35 y = 1925

where x and y are gallons consumed by 1st and 2nd car.

We have two equation now,

x + y = 75                   (1)

15 x + 35 y = 1925     (2)

Multiplying eq(1) with 15 and subtracting eq (1) and 2

15 x + 15 y = 1125

15 x + 35 y = 1925

-       -            -

_______________

0 - 20 y = -800

y= -800 / -20

y = 40

Putting value of y in equation 1

x + y = 75

x + 40 = 75

x= 75 - 40

x = 35

x= 35 gallons consumed by 1st car

and y= 40  gallons consumed by 2nd car

4 0
3 years ago
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