Find an equation of the line. Write the equation using function notation.
Through (3,−6); perpendicular to 4y=x
"y= \\frac{1}{4}x"
Gradient of the line "=-(\\frac{4}{1})=-4"
"y=-4x+c"
When "x=3,\\>y=-6"
"-6=-4(3)+c"
"c=6"
"f(x)=-4x+6"
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