5x + 4 = 10x - 5 10x - 5x = 4 + 5 5x = 9 x = 1.8
5x-x=36 4x=36 x=36/4 x=9
If X = 9 then 5X would = 5 x 9, which is 45.
172=x
x=4
5x + 4 = 10x - 5 10x - 5x = 4 + 5 5x = 9 x = 1.8
5X - 2Y X = 9 Y = 4 5(9) - 2(4) 45 - 8 37 is the value
5x-x=36 4x=36 x=36/4 x=9
If X = 9 then 5X would = 5 x 9, which is 45.
172=x
5x + 9 = 4Subtract 9 from each side:5x = -5Divide each side by 5:x = -1
x=4
5x = 4x + 9 x = 9
39 = 5x + 9 5x = 39 - 9 5x = 30 x = 30 / 5 x = 6
factors are (x + 9)(x - 4) so x = 4 or -9. Does that help?
x2-5x-36 = (x-9(x+4) when factored
x2 + 4x - 9 = 5x + 3 ∴ x2 - x - 12 = 0 ∴ (x + 3)(x - 4) = 0 ∴ x ∈ {-3, 4}