Monday to Thursday sales= a1 + b1*Temp

Friday sales = a2 + b2*Temp

I'm trying to determine whether Friday Sales are the same as Monday to Thursday sales. By 'the same' I mean that variations between a1 and a2, and b1 and b2 are just due to random sampling. Let's say that the Null Hypothesis is that they are the same. Ideally, I would like to be able to state a confidence level such as 'we can be 95% confident that both a1=a2 and b1=b2".

There are fewer data points in the friday regression than the monday-thursday regression. The set of Temp values in the Monday to Thursday data set are interspersed with the Temp values of the Friday data set (ie. similar range, but not exactly same temperature values). By observing the data I am happy to assume that the two sales types have equal variances. By observation, it appears that the both sets of regression errors (residuals) are normally distributed.

My questions are:

1 Is it possible/does it makes sense to try to get a combined statistical measure across both sales/temperature gradient AND intercept at the same time, as opposed to doing them separately ?

2 If so, what is the procedure/formula? Is it an example of independent two-sample t tests rather than Dependent t test for paired samples, or are F tests appropriate - sorry, I'm struggling ! I'm a base SAS / Enterprise Guide user.

Many thanks for your assistance.

Daniel.