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3 years ago

Solve the system by elimination. . 4x-9y=-21 , -4x-3y=9

Mathematics

1 answer:

Ivan3 years ago

7 0

(-3, 1)
4x-9y=-21
+-4x-3y=9
-12y= -12
y=1

4x- 9(1)= -21
4x-9=-21
+9 +9
4x= -12
x=-3

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padilas [110]

Answer:

Step-by-step explanation:

The formula for determining simple interest is expressed as

I = PRT/100

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I represents interest paid on the amount deposited.

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From the information given,

P = 2500

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3 years ago

Read 2 more answers

A rectangular pan has a length that is the width. The total area of the pan is 432 in.2. What is the width of the cake pan? A =

spayn [35]

Answer:

Let width = w

length = 4w/3

Area = 432 = length*width = w*4w/3

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w^2 = 432*3/4 = 324

w = 18

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3 years ago

Which rational number represents a decrease in water level from 8 feet to 6 feet?

Alexxx [7]

-6/8...I guess so
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6 0

3 years ago

PLEASE HELP ASAP GIVING 100 POINTS

Inessa [10]

Answer:

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Step-by-step explanation:

First we need to know the formula for finding the height of a cylinder

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2 years ago

7. The points (3,5) and (2, y) are on a line with a slope of 3. Find y.

PtichkaEL [24]

Answer:

We get value of y: y = 2

Step-by-step explanation:

The points (3,5) and (2, y) are on a line with a slope of 3. Find y.

We can find y using formula of finding slope of a line.

The formula is: $Slope=\frac{y_2-y_1}{x_2-x_1}$

We have $x_1=3, y_1=5, x_2=2, y_2=y$ and Slope = 3

Putting values and finding y

$Slope=\frac{y_2-y_1}{x_2-x_1}\\3=\frac{y-5}{2-3}\\3=\frac{y-5}{-1}\\-1(3)=y-5\\-3=y-5\\y=-3+5\\y=2$

So, we get value of y: y = 2

5 0

3 years ago