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y= 1/2x+2 OR y=1/4x+9
x + y = -1 (a) 4x - 3y = 12 (b) 3(a)+(b) gives 3x + 3y + 4x - 3y = -3 + 12 or 7x = 9 or x = 9/7 then x + y = -1 gives y = -1 -x = -1 - 9/7 = -16/7 So, x = 9/7 and y = -16/7
4x + 3y = 8x + y so 3y - y = 8x - 4x ie 2y = 4x so y = 2x
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.
How do you solve y=-4x+1