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Dmitry_Shevchenko [17]
3 years ago
8

The point-slope form of the equation of the line that passes through (–5, –1) and (10, –7) is y + 7 = (x – 10). What is the stan

dard form of the equation for this line? 2x – 5y = –15 2x – 5y = –17 2x + 5y = –15 2x + 5y = –17
Mathematics
2 answers:
taurus [48]3 years ago
7 0
The answer is 2x +5y=-15
ra1l [238]3 years ago
3 0
2x-5y=-17!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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Sherri saves nickels and dimes in a coin purse for her daughter. The total value of the coins in the purse is $0.95. The number
forsale [732]
I’m guessing that this is for systems of equations?
n - nickels
d - dimes

These are the equations you start off with.
n = 5d-2
0.95 = 0.10d+0.05n

Substitute the top equation for n into the variable n in the bottom equation.
0.95 = 0.10d+0.05(5d-2)

Solve for d.
0.95 = 0.10d+0.25d-0.10
1.05 = 0.35d
3 = d

Substitute d into the top equation and solve for n.
n = 5(3)-2
n = 15-3
n = 12

There are 3 dimes and 12 nickels in the coin purse! Hope this helped <3

7 0
2 years ago
Read 2 more answers
What is 4/3 times 3/7=?
Sidana [21]
The answer is 4/7 in simplest form
3 0
3 years ago
The expressions p-0.15p can be can be used to calculate the final cost of an item that has a price of p and is discounted 15%. W
lora16 [44]

Answer:

The original cost is $19.55

Step-by-step explanation:

What we want to do here is calculate the final cost, given the original price

What we have to do here is to substitute the value of $23 for p

This we have as;

23-0.15(23)

= 23-3.45

= $19.55

3 0
3 years ago
On Friday, the temperature changes -30 each hour. If the temperature changed for 7 hours, what is the total temperature change?
Marina86 [1]

A -120 difference will be seen in the temperature within a 7 hour period

<u>Equation</u>

<em>-</em>30 x 7

<em>Multiplying two of different signs ( - + ,  + - ) will always be negative.</em>

<em>Multiplying two of the same sign ( - - , + + ) will always be positive.</em>

8 0
3 years ago
Write and solve a quadratic equation for the situation below. Choose the answer that has both an equation that correctly models
Sedbober [7]
The answer 
<span>the true answer  is A) 4x^2+52x+165=320; x = 2.5 
proof:
since </span><span>they want to limit its area to 320 in^2
x must be equal 2.5, because </span>4.(2.5)^2+52(2.5)+165= 25+130+165=320;

the main rule of the area of a triangle is 

A= (base x height )/2
let be b the base and h the height 
so h=20- 6b
so 50= b x( 20-6b) /2, implies 100/b = 20 - 6b
if b=x, we have 100= 20x -6x² this  is equivalent to 6x² - 20x = -100
so the answer is 
<span>D) None of the choices are correct.
</span>
<span>the largest dimensions that can be used for the fountain are
</span>
<span>B) x^2+8x+16=800

C) x^2+16=800
</span>
proof
x^2+8x+16=x^2+8x+4², 4² is the area of the square fountain, and x^2+8x should be the remaining of the area, t<span>he total space that the fountain and sidewalk can use is 800, it is  less than 800 ft^2.
</span>Use the same method for. x^2+16=800

8 0
2 years ago
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