y = -2
4x - 3y = 18 (use the substitution method)
4x - 3y = 18 (substitute -2 for y, and solve for x))
4x - 3(-2) = 18
4x + 6 = 18 (subtract 6 to both sides)
4x = 12 (divide by 2 to both sides)
x = 3
Thus, (3, -2) is the solution of the given system of equations.
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3(x+2) = x -18 3x+6 = x -18 3x -x = -18 -6 2x = -24 x = -12
x2 + 8x - 2 = 0 => x2 + 8x = 2 => x2 + 8x + 16 = 2 + 16 = 18 => (x + 4)2 = 18 => x + 4 = +or- sqrt(18) = +or- 3*sqrt(2) so x = -4 +or- 3*sqrt(2)
3x+12 = 18 3x = 18-12 3x = 6 x = 2
log9(x)=2 x=9^2 x=81
6 - 9w = 24 -9w = 18w = -2