4x + 2y = 4
Is y a function of x?

Yes y is a function of x.

Rewrite the function using algebra to get this:

y = -x + 2

That forms an equation of a line whose slope is -2 and whose y-intercept is 2

X= 49; x = 4step 1: foilstep 2: equal both to 0step 3: find x individually