The slope between points A and C is $\_\_\_\_\_\_\_\_\_\_\_\_$ and is known as the $\_\_\_\_\_\_\_\_\_\_\_\_.+0\mathrm{.}82$; marginal rate of transformation $($MRT$)1\mathrm{.}64$; marginal rate of transformation $($MRT$)+1\mathrm{.}64$; marginal rate of substitution $($MRS$)0\mathrm{.}82$; marginal rate of substitution $($MRS$)$