3x+42=6x+12 42=6x-3x+12 42=3x+12 42-12=3x 30=3x 10=x
3x-4x=12 that means -x equals 12 so x equals -12
3x=12 3x/3=12/3 x=4
12
3x+8 = 12 3x = 4 x = 4/3
3x+42=6x+12 42=6x-3x+12 42=3x+12 42-12=3x 30=3x 10=x
3x+12 = 18 3x = 18-12 3x = 6 x = 2
Well, if 3x equals 12, then x equals 4. And if y equals 3x, then y equals 3 times 4, which is 12. So, y equals 12. Math can be a piece of cake when you break it down like that!
3x-4x=12 that means -x equals 12 so x equals -12
3x=12 3x/3=12/3 x=4
-9
3x - y = 12 is the same as 3x - 12 = y, or y = 3x - 12.
12
y = 12. It's the transitive property. y = 12 = 3x.
y-3x+6y=12 7y=3x+12 y=3x/7 +12/7
6x - 12 = 3x + 15 3x = 27 x = 9
3x+8 = 12 3x = 4 x = 4/3