-10x-6 = -12
-10x = -12+6
-10x = -6
x = 3/5
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If: y = 10x -12 and y = x^2 +20x +12 Then: x^2 +20x +12 = 10x -12 Transposing terms: x^2 +10x +24 = 0 Factorizing: (x+6)(x+4) = 0 => x = -6 or x = -4 Points of intersection by substitution are at: (-6, -72) and (-4, -52)
5=4x 1.25=x
10x + 3 = 15 10x = 15 - 3 10x = 12 x = 1.2
y=-10x-4
6-3x = 5x-10x+10 6-3x = -5x+10 -3x+5x = 10-6 2x = 4 x = 2