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write a function for an arithmetic sequence that includes the points (3,8) and (4,6)

Sagot :

The function for an arithmetic sequence is

[tex]a_n=-2n+14[/tex]

Given :

Given point are (3,8) and (4,6)

To find function for arithmetic sequence , Lets frame an equation using slope intercept form f(x)=mx+b

where m is the slope and b is the y intercept

Lets find out slope using the given points

[tex]m=\frac{y_2-y_1}{x_2-x_1} =\frac{6-8}{4-3} =-2[/tex]

Now we find y intercept b. Use point (3,8)

x is 3  and f(x) is 8

[tex]y=mx+b\\y=-2x+b\\8=-2(3)+b\\8=-6+b\\Add 6\\b=14[/tex]

Function becomes f(x)=-2x+14

The function for an arithmetic sequence is

[tex]a_n=-2n+14[/tex]

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