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3 years ago

Which of the following ordered pairs represents the x-intercept of the equation y = 2x - 8?

2 answers:

4 0

Y=2x-8, so ti find the x-intercept, you would plug zero into y and solve for x:

0=2x-8 plug 0 in for y and now add 8 to both sides
8=2x now you have to divide by 2
4=x
(4,0)

nikdorinn [45]3 years ago

3 0

The answer is (0,-8)

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Answer:

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Step-by-step explanation:

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Mice21 [21]

Answer:

$T_7 = 11$

$T_n = 2n- 3$

Step-by-step explanation:

Given

$S_n = n^2 -2n$

$T_n = S_n - S_{n-1}$

Solving (a): T7

Substitute 7 for n in $T_n = S_n - S_{n-1}$

$T_7 = S_7 - S_{7-1}$

$T_7 = S_7 - S_6$

Calculate S7 and S6

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So:

$T_7 = 35 -24$

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$T_n = S_n - S_{n-1}$

Where $S_n = n^2 -2n$

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We have:

$S_{n-1} =(n-1)^2 - 2(n-1)$

Open brackets

$S_{n-1} = n^2 -2n + 1 -2n +2$

$S_{n-1} = n^2 -2n-2n + 1 +2$

$S_{n-1} = n^2 -4n + 3$

So:

$T_n = S_n - S_{n-1}$

$T_n = n^2 - 2n - (n^2 -4n + 3)$

$T_n = n^2 - 2n - n^2 +4n - 3$

Collect Like Terms

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