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3 years ago

When solving using Elimination:

Mathematics

1 answer:

Zielflug [23.3K]3 years ago

6 0

Answer:

Multiply 1st equation by -4

Step-by-step explanation:

Multiply the 1stequation by-4

-20x+8y=-44. Leave 2nd equation

8x-8y=-16

See how the 8y cancels with -8y

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Can anyone help please with 6 and 7 I’m in desperate need of can someone help please and God bless

saw5 [17]

6.) 9
5(9)+18=63
Divide 9+13x (since its the entire line) by 2 to get 4.5+6.5x so it can equal Half
4.5+6.6(9)=63

7.) IF=HF
The three lines indicate they are equal to eachother

Hope that helps!

8 0

2 years ago

The parent function f (x)= 2^xis reflected across the x-axis,

skad [1K]

Answer:

$F(x) = 2^{x+2} - 6$

Step-by-step explanation:

To shift a function F(x) a units to the left, we do:

$F(x) = F(x+a)$

In this problem, we have that:

$F(x) = 2^{x}$

So, shifting 2 units left:

$F(x) = 2^{x+2}$

Then

To shift a units down, we do:

$F(x) = F(x) - a. So[tex]F(x) = 2^{x+2}$

Shifting 6 units down

$F(x) = 2^{x+2} - 6$

5 0

3 years ago

PLEASE HELP ME I NEED THIS DONE ASAP NO LINKS !!!

d1i1m1o1n [39]

Answer:

Step-by-step explanation:

20- coefficient

w- variable

3 0

2 years ago

A block of ice weighing 20 lb is taken from the freezer where it was stored at -15"F. How many Btu of heat will be required to c

timofeeve [1]

Answer:

6700.6 BTU

Step-by-step explanation:

First you have to warm the block from -15° F to 32°F, the heat to needed to do this is:

$Q_{1}=mc\Delta T=20lb*0.49\frac{BTU}{lbF} *(32F-(-15F))=460.6BTU$

After you need to melt the ice. The heat you need is:

$Q_{2}=mL=20lb*144\frac{BTU}{lb}=2880BTU$

Finally, you need to heat the water from 32° F to 200 ° F, and the heat for this is:

$Q_{3}=mc\Delta T=20lb*1\frac{BTU}{lbF} *(200F-32F)=3360BTU$

$Q=Q_{1}+Q_{2}+Q_{3}=460.6BTU+2880BTU+3360BTU=6700.6BTU$ To have the total heat you used you have to su $Q_{1},Q_{2}$ and $Q_{3}$

6 0

3 years ago

1. What is the slope of the line passing through (-2,3) and (4, -5)?

olganol [36]

Answer:

Step-by-step explanation:

hello :

1) Hello :

let A(-2,3) B(4,-5)

the slope is : (YB - YA)/(XB -XA)

(-5-3)/(4+2) = -8/6 =-4/3

2) Use the point-slope formula.

y - y_1 = m(x - x_1) you have :

m=0 x_1=4 y_1=6

an equation for this line is : y-6 =0(x-4)

so : y=6

7 0

3 years ago