It does nothing! 4x + 6y = 24 7x + 6y = 9 Subtracting the first equation from the second gives: 3x = - 15 so that x = -5 Substituting the value of x in the first equation gives -20 + 6y = 24 so that 6y = 44 and so y = 22/3 or 71/3
-7x + 5 = -9 -7x = -14 7x = 14 x = 2
Two ways to see this: 6y=8-9+6y 6y=6y-1 No answer here 6y= 8-(9+6y) 6y+(9+6y)=8 12y+9=8 12y=-1 y= -(1/12) or -0.08333...
Subtract 7x from each side: 8 = -9 Not possible, game over.
8x-2 = -9+7x8x-7x = -9+2x=-7
It does nothing! 4x + 6y = 24 7x + 6y = 9 Subtracting the first equation from the second gives: 3x = - 15 so that x = -5 Substituting the value of x in the first equation gives -20 + 6y = 24 so that 6y = 44 and so y = 22/3 or 71/3
The variables in the given expression are x and y
-7x + 5 = -9 -7x = -14 7x = 14 x = 2
4x+9 = 7x+3 4x-7x = 3-9 -3x = -6 x = 2
Two ways to see this: 6y=8-9+6y 6y=6y-1 No answer here 6y= 8-(9+6y) 6y+(9+6y)=8 12y+9=8 12y=-1 y= -(1/12) or -0.08333...
Subtract 7x from each side: 8 = -9 Not possible, game over.
8x-2 = -9+7x8x-7x = -9+2x=-7
7y-8 = 6y+1 7y-6y = 1+8 y = 9
7x + 9 = 51 7x = 42 x = 42/7 = 6
(3, 3)
79
-9x+6y = 54 6y = 9x+54 y = 1.5x+9 slope = 1.5