y = 4x is a formula or open statement. It can be used to define the function,
f = [(x,y) : y = 4x} , commonly denoted by f(x) = 4x.
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Since there are no "following" points, none of them.
y = 2x-5 4x-y = 7 => y = 4x-7 2x-5 = 4x-7 2x-4x = 5-7 -2x = -2 x = 1 Therefore by substituting: x = 1 and y = -3
4x + 3y = 8x + y so 3y - y = 8x - 4x ie 2y = 4x so y = 2x
4x-y+7=0
y=xsquared-4x+2