This should be easy because we just have to use substitution method. Substitute the value of x from the second equation into the x of the first equation.
-4(2y) + 11y = 15
-8y + 11y = 15
3y = 15 ; y = 5
Substitute this value of y to either the first or second equation.
x = 2(5) = 10
The ordered pair is therefore (10,5).

6 0

3 years ago

If f(x) = -2x - 3, find f(0) - 7. <br><br><br>help please!! I will give brainliest!!!!

VikaD [51]

Hi there!

$\huge\boxed{-10}$

f(x) = -2x - 3

Plug in 0 for "x" to solve for f(0):

f(0) = -2(0) - 3

f(0) = -3

Since the question is asking you to evaluate f(0) - 7, simply subtract:

-3 - 7 = -10.

7 0

2 years ago

F(x)= 9-x^2, x ≥ 0. f^-1(x)=??

julia-pushkina [17]

$y=9-x^{2},\ x\ge0$

Reverse $x$ and $y$ :
$x=9-y^{2},\ y\ge0$
Solve for $y$ :
$x=9-y^{2}$
$\rightarrow y^{2}=9-x$
$\rightarrow y=\sqrt{9-x}$ since $y\ge0$

7 0

3 years ago

Martino drove 1,734 miles in 34 hours. What was his average speed for e trip, in miles per hour?

Aliun [14]

Answer:

51 mph

Step-by-step explanation:

1734 miles

---------------- (per)

34 hours

you would divide. think of it as a fraction

1734

----

the numerator is miles and the denominator is hours. divide the numerator (the top number) by the denominator (the bottom number).

1734/34= 51

therefore, martino drove 51 miles per hour

Hope this helps!

7 0

2 years ago