Q.)  How do u formulate ( write ) systems of equations. 

question- at martis mexican restaurant,2 tacos and 3 enchiladas cos$2.39. if you buy 4 tacos and 5 enchiladas the cost is $4.23. write a system that will determine the cost for one taco(t) and for one enchilada(e).???

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Ans.1)  Let the cost of one tacos and one enchiladas is t and e respectively.

As given

2t+3e=$2.39

4t+5e=$4.32

Now using these two equations we can determine the cost for one taco and for one enchilada.