Question

aflati x si y din : a) 5x+25supra x+3 simplificat prin y=x+5 supra3 ; b) 2x+3 supra7 amplificat cu y=8x+12 supra x+5

Answer 1

a) 5x + 25 supra x + 3 s y = x + 5 supra 3 => y = (5x + 25) : (x + 5) = 5 
    (x + 3) : 5 = 3 => x + 3 = 5 x 3 = 15 => x = 15 - 3 = 12
b) 2x + 3 supra 7 a y = 8x + 12 supra x + 5
    7y = x + 5
    x = 7y - 5 
    y = (8x + 12) : (2x + 3) = 4
    x = 7 x 4 - 5 = 28 - 5 = 23