$\begin{array}{l}y=\frac{3}{2} X-1 \\ -6 X+4 Y=-12\end{array}$

Begin, commence, start, initiate, inaugurate, usher in mean to take the first step in a course, process, or operation. Begin, start, and commence are often interchangeable. We can use the verbs begin and start to mean the same thing but begin is more formal than start.

Begin is an irregular verb. If you say that you cannot begin to imagine, understand, or explain something, you are emphasizing that it is almost impossible to explain, understand, or imagine. Used with noun phrases if you start or begin something, you do it from a particular time.

Begin, commence, initiate, start (when followed by noun or gerund) refer to setting into motion or progress something that continues for some time. Begin is the common term: Begin is typically used when indicating the initial point of a continuous action or the commencement of a more formal or serious event.

Definition of begin verb in oxford advanced learner's dictionary. 6 days agobegin (third-person singular simple present begins, present participle beginning, simple past began, past participle begun) (ergative) to start, to initiate or take the first step into something. Ye nymphs of solyma, begin the song.