Answer:
Step-by-step explanation: the equation y=mx+b is for slope. whih can be written as mx+b=y i think. but you equation is x+y=69 there is no mx or b so i can not solve this is not even slope try adding numbers together that would equal 69 and anwser which one pops up on the test whatever you are using that is a dumb equation they need to be teaching you the right way man im sorry you should switch schools man
