6 + 2x = 5x + 9 , 6 - 9 = 5x - 2x , -3 = 3x , x = -1
(5x 2 - 8x + 1) + (2x 2 - 4x - 11)
4x+9=25 4x+9=25-9 4x/4=1 16/4=4 4x+9=26 4(4)+9=25 16+9=25 The answer is 4
If: 5x+2y = 9 Then: y = -2.5x+4.5 in slope intercept form
if you meant 5x+9=3*15 then, 5x = 36, x = 7.2 if you meant 5x+9=3x+15 then, 2x = 6, x = 3
-5x + x + 9 = -4x + 12 -4x + 9 = -4x + 12 9 = 12 This equation has no solution.
4x - 10 + 5x = 719x = 81x = 9
9 + 5x = -4x + 63 9 + 9x = 63 9x = 54 9x/9 = 54/9 x = 6
5x + 14 = 95 - 4x 5x + 4x = 95 - 14 9x = 81 x = 81/9 x = 9
4x + 55 = 9x + 10 55 = 5x + 10 45 = 5x x = 9
x= -11
(-4, -1)
9x = 4x + 45 5x = 45x = 9
5x - 9 = 4x 5x - 4x - 9 = 4x - 4x x - 9 = 0 x - 9 + 9 = 0 + 9 x = 9
minus 4 plus 9 = 5, so 5x
x2+4x-9 = 5x+3 x2+4x-5x-9-3 = 0 x2-x-12 = 0 (x+3)(x-4) = 0 x = -3 or x = 4
x2 + 4x - 9 = 5x + 3 ∴ x2 - x - 12 = 0 ∴ (x + 3)(x - 4) = 0 ∴ x ∈ {-3, 4}