Okay I understand a little bit but have a problem with this equation e + f = 4 2d + 4e - f = -3 3e = -3 Please help or make a video so i know the steps Thanks! :)

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Well, if you take the third problem 3e=-3, you can easily solve for e by dividing both sides by three.This gives you e = -1, which you can plug in to the first equation:(-1) + f = 4  --> f = 5so now we know e and f to plug in to the second equation:2d+4(-1)-(5) = -3 --> 2d -4 -5 = -3--> 2d - 9 = -3 --> 2d = 6 --> d = 3So now we know d, e, and f: d = 3, e = -1, f = 5