Treat f(x)=y aka solve for x disregard f(x) then plug into y (3.3)
Slope intercept form etc also applies tooo
f(x) = -2(0)
'plug in a rando #'
you plugged in 0 for x so x=0, the answer you got was 0 so y=0
No solution: answer is different numbers or letters
Infinitely Many solutions: Both sides of equation are identical
Infinity always has parenthesis
brackets apply to the greater/less than or equal to sign and
when you divide a negative inequality term, you swap the >,< etc.
y-y(1) over x-x(1)
when in doubt make a table
For each x there is exactly one y in the range
Slope is a negative reciprocal of the other line