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Write the linear function f with the values f(1) = 1 and f(-3) = 17. (Note: Use f(x) instead of y.) Show work to get full credits.

User Lorean
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1 Answer

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Given:

f(1) = 1 and f(-3) = 17

To find:

The lines function f.

Solution:

If f(a) = b, it means the function f passes through (a,b).

Here, f(1) = 1, it means the function f passes through (1,1).

f(-3) = 17, it means the function f passes through (-3,17).

If a linear function passes through two point
(x_1,y_1)\text{ and }(x_2,y_2), then the equation of line is


y-y_1=(y_2-y_1)/(x_2-x_1)(x-x_1)

The linear function f passes through (1,1) amd (-3,17). So, the equation of linear function is


y-1=(17-1)/(-3-1)(x-1)


y-1=(16)/(-4)(x-1)


y-1=-4(x-1)


y-1=-4x+4

Add 1 on both sides.


y-1+1=-4x+4+1


y=-4x+5

Put y=f(x), to write in function notation.


f(x)=-4x+5

Therefore, required lines function is
f(x)=-4x+5.

User Orius
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