if -9x = 45
we need to get only one x, so we need to devide by 9 to get one x. But what we do to the left hand side we must do to the right hand side to keep the equation balanced, so we must also devide the right hand side by 9 to give:
-x = 5
now to get a positive x we need to multiply the x by -1 (minus times minus=plus), and remember what we do to the left hand side we must do to the right hand side to keep the equation balanced. This gives:
x = -5
2y - 9x = 14 2y = 14 + 9x y = (14 + 9x) / 2
Divide both sides of the equation by x: x2 = 9x x2 / x = 9x / x x = 9
2x+3=9x 3=9x-2x 3=7x x=3/7
7x-4=9x+10-14=2xx=-7
9x - 9 = 36 9x = 45 x = 5
9x = 4x + 45 5x = 45x = 9
9x+6=51 9x = 45 x= 5 9x-6=51 9x = 57 x= 6.33
9x-3y=63 7x-3y=45 -3y=63-9x -y=21-3x y=-21+3x 7x-3(-21+3x)=45 7x+63+9x=45 7x+9x=45-63 16x=-18 x=-1.125 y=-21+3(-1.125) y=-24.375 (-1.125,-24.375)
Add 45 to each side, giving 9x = 45. Divide both sides by 9, giving x = 5
5x+4x-10 = 35 9x = 35+10 9x = 45 x = 5
( (45) (9x) )
4x + 55 = 9x + 10 55 = 5x + 10 45 = 5x x = 9
y=9x=3it equals ......y= 3.334
x=-7
If x equals 10 and y equals 10, then 9x plus 8y equals 170.
9x+27 = -81 9x = -81-27 9x = -108 x = -12
10x = 9x -25 10x -9x = -25 x = -25