Please help I have a quiz soon

Answer:The option that no represent a linear function is [tex]f(x)=3^x[/tex]Step-by-step explanation:we know thatThe graph of a linear function is a straight lineThe equation of a linear function in slope intercept form is equal to[tex]f(x)=mx+b[/tex]wherem is the slopeb is the y-interceptVerify each caseoption 1) we have[tex]f(x)=3x-2[/tex]This option represent a linear functionwherem=3b=-2option 2) we have[tex]f(x)=x[/tex]This option represent a linear functionwherem=1b=0This option represent a linear direct variation functionoption 3) we have[tex]f(x)=3^x[/tex]This option not represent a linear functionThis option represent a exponential functionoption 4) we have[tex]f(x)=3x[/tex]This option represent a linear functionwherem=3b=0This option represent a linear direct variation function