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stealth61 [152]
3 years ago
7

10x-2y=18 8x=y solve by substitution

Mathematics
2 answers:
lana [24]3 years ago
4 0

Answer:

x = -1 and y = 18

Step-by-step explanation:

Given the system of equations

y + 8x = 10... 1

2y - 4x = 40 ... 2

From 1; y = 10-8x

Substitute into 2;

2(10-8x) - 4x = 40

20 - 16x - 4x = 40

20 - 20x = 40

-20x = 40 - 20

-20x = 20

x = -1

Recall that y = 10-8x

y = 10 - 8(-1)

y = 10 + 8

y = 18

therefore your answer is  x = -1 and y = 18

spin [16.1K]3 years ago
4 0

\large\huge\green{\sf{Answer:-}}

10x-2y=18 _______(i)

8x=y________(ii)

put value of y in first equation

=> 10x-2(8x)=18

=>10x-16x= 18

=> -6x= 18

=> x= -3

now to find y put in second equation

8x-y

=> 8(-3)= y

=> y= -24

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Lorico [155]

Answer:

Given function:

f(t) = (-16t - 2)(t - 1)

<h3><u>Part 1</u></h3>

The zeros of the function are the values of t when f(t) = 0

⇒ f(t) = 0

⇒ (-16t - 2)(t - 1) = 0

⇒ (t - 1) = 0  ⇒  t = 1

⇒ (-16t - 2) = 0  ⇒ t = -2/16 = -1/8

<h3><u>Part 2</u></h3>

The zeroes tell us the time (in seconds) when the ball is at ground level (when its height is zero).

Since time is not negative, only one zero is meaningful:  t = 1

Therefore, the total journey of the ball, from throwing it to it hitting the ground, is 1 second.

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The height the ball is thrown can be determined by inputting t = 0 into the function:

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2. Reciprocate 7/4

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4. Simplify/Solve

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Answer:

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Now plug in these values in the above formula, we get

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When we round of to the nearest whole number, we get 101

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