Refer to the exhibit below.

$\backslash$table$[[,$Coefficient,Standard Error$],[$Constant$,145\mathrm{.}321,48\mathrm{.}682],[x_1,25\mathrm{.}625,9\mathrm{.}150],[x_2,-5\mathrm{.}720,3\mathrm{.}575],[x_3,0\mathrm{.}823,0\mathrm{.}183]]$

The interpretation of the coefficient on $x_1$ is that

$$ a one unit change in $x1$ will lead to a $25\mathrm{.}625$ unit increase in $x2$ when all other variables are held constant

$$ a one unit change in $x1$ will lead to a $25\mathrm{.}625$ unit increase in $Y$ when all other variables are held constant

It is impossible to interpret the coefficient.

$$ a one unit change in $x1$ will lead to a $25\mathrm{.}625$ unit change in $Y$