All categories

3 years ago

9x - 3y = -42 and -9x + 8y =22

Mathematics

1 answer:

ASHA 777 [7]3 years ago

8 0

Answer:

(-5 1/9, -4)

Step-by-step explanation:

Add the equations

5y=-20

y=-4

-9x+8(-4)=22

-9x-32=22

-9x=46

x= - 5 1/9

You might be interested in

20 is what percent of 160

stira [4]

In this problem WP means what percent

20 = WP X 160

solve for WP, by dividing both sides by 160

and you get:

0.125 = WP

Change your decimal into a percent by multiplying by 100%

12.5% is your result.

7 0

4 years ago

A recipe for a cake instructs you to bake it at 220° C for 45 minutes. How many degrees Fahrenheit is this?

sergiy2304 [10]

This is an exercise on Thermometric scales.

We have as data:

T = 220 °C
T = °F ??

We apply the following formula:

$\large\displaystyle\text{$\begin{gathered}\sf ^{\circ}F=\frac{9}{5}\ ^{\circ}C+32 \end{gathered}$}$

We substitute data in the formula:

$\large\displaystyle\text{$\begin{gathered}\sf ^{\circ}F=\frac{9}{5}\times220+32 \end{gathered}$}$

First multiply 9 x 220, then the result of this division is divided by 5.

$\large\displaystyle\text{$\begin{gathered}\sf =396+32 \ \ \to \ \ [Add] \end{gathered}$}$

$\boxed{\large\displaystyle\text{$\begin{gathered}\sf =428 \ ^{\circ}F \end{gathered}$}}$

Therefore the cake recipe that should be baked at 220 °C for 45 minutes, on the Fahrenteir scale is 428 °F. Which indicates that it will be very hot.

3 0

2 years ago

The value of 9 in 90,000 is how many times the value of 9

Semmy [17]

The value is 10,000!!!

8 0

4 years ago

True or false, If false what would be the right word to use

Colt1911 [192]

Tge answer to this problem is “true“

4 0

3 years ago

I hoped the graph would be a line with x-intercept 1 and y-intercept 1. The equation of such a line is....

ivolga24 [154]

X-intercept means y equals to 0
y-intercept means x equals to 0

If you plug in (0, 1) and (1, 0), you will notice that only x + y = 1 will work for both points

Your answer is B) x + y = 1

5 0

3 years ago