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-5x + 13 = -12 -5x = -12 - 13 = -25 x = -25/-5 = 5
(1) 5x+y=-12 (2) 7x-3y=-30 From (1) one gets y = -12-5x Put into (2) 7x-3y = 7x -3 (-12-5x) = 7x + 36 +15 x = 22x +36=-30 22x = -30-36 = -66 so x = -3 and y=-12-5x = -12-5x-3= 3 The solution is (-3,3)
3x-4=5x+6 gives: 2x=-10 which gives x=-5
Add 4x - 2 to each side: 5x = 5 x = 1
Think of this a 12 x-rays + 5 x-rays Makes 17 x-rays. 12x+5x=17x