Hi, we need to use the log properties taking into account that Ln(2) is aprox. 0.69 and Ln(3) is aprox. 1.10. I think you can understand better as we solve it, so here it goes.
Since:
Then
Now, we have everything where we want it, in terms of Ln(2) and Ln(3), now it is easy to solve.
Different points are used to identify the line, this can mean that both points lie on the same line. Therefore the slope is the same because the line passes through both those points.