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First of all, if 'x' is 3, then 'x' doesn't equal -3x+3 . You must mean y = -3x + 3.If x=3, then (-3x + 3) = -6 .The graph is the point (3, -6) .
you mean: x+3x+3=x+18 so x=5
3x+7=37 -7 -7 3x=30 /3 /3 x=10
x-2=3x+1 x=3x+1+2 x-3x=3 -2x=3 x=-3/2
-3x=-15+6 -3x=-9 x=-9/-3 x=3
x = 0
9x2 + 3x / 3x equals (3x + 1).9x2 + 3x divided by x is 9x + 3 , and then divided by 3 yields the 3x +1.
3x-3 = 6 3x = 6+3 3x = 9 x = 3
you mean: y= -3x+1 y+x=-3+1 solve -3+1= -2 y+x = -2
2x+3=3x-3 2x-3x=-3-3 -x=-6 x=6
3x=10 x=10/3
when you say 3x, you mean that there are 3 x's. Multiplication implies repeated addition, so three x's added is x+x+x, which equals 3x.