All categories

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

You might be interested in

PLEASE HELP I WILL GIVE BRAINLIEST TO ANYONE WHO WANTS IT AFTER THEY ANSWER IT!!!!!!! PLEASE HELLP ME I NEED TO GET THE DONE STA

Aleksandr [31]

I think u have to Multiply the 100 and 0.30 and that would be 30

6 0

4 years ago

Ed is parallel to ab..can someone help me with the proof towards this?

NemiM [27]

Answer:

Area_ACD = [AC*CD*sinC]/2

Area_BCE = [BC*CE*sinC]/2

AC*CD = BC*CE (as Thales theorem AC/CE = BC/CD)

Then, Area_ACD = Area_BCE

7 0

3 years ago

The length of a violin string varies inversely with the frequency of its vibrations. A violin string 14 inches long vibrates at

lara31 [8.8K]

Answer: 525 cycles per second.

Step-by-step explanation:

The equation for inverse variation between x and y is given by :-

$x_1y_1=x_2y_2$ (1)

Given : The length of a violin string varies inversely with the frequency of its vibrations.

A violin string 14 inches long vibrates at a frequency of 450 cycles per second.

Let x = length of a violin

y= frequency of its vibrations

To find: The frequency of a 12 inch violin string.

Put $x_1=14,\ x_2=12\\y_1=450,\ y_2=y$ in equation (1) , we get

$(14)(450)=(12)(y)$

Divide both sides by 12 , we get

$y=\dfrac{(14)(450)}{12}=525$

Hence, the frequency of a 12 inch violin string = 525 cycles per second.

3 0

3 years ago

-4/7p + (-2/7p) + 1/7

horsena [70]

Answer:

$\frac{1-6p}{7}$

Step-by-step explanation:

- $\frac{4}{7}p + (-\frac{2}{7}p) + \frac{1}{7}$

Factor out $\frac{1}{7}$

$\frac{-4p - 2p + 1}{7}$

Consider −4p − 2p + 1. Multiply and combine like terms.

-6p + 1

Rewrite the complete factored expression.

$\frac{-6p + 1}{7}$

Hope it helps and have a great day! =D

~sunshine~

3 0

2 years ago

1) XS 3 - -N -5 -4 -3 -2 -1 0 1 2 3 4 5 5

cestrela7 [59]

Answer:

times 3

Step-by-step explanation:

So this is like integers because it is negative numbers and positive numbers when it is positive and odd numbers that means you could use a number line because numberlines have positive and negative numbers.

5 0

3 years ago