Course Knowledge base

LanguageAccount

Exercise for Drawing a relationship

Recognise a relationship

Someone claims that $2y = x + 4$ is a relationship, just like $y = x + 1$ from this lesson. Is it a relationship?

Your answerNo, a single equation with two letters in it always has to be solved for one of them before it means anythingYes, every pair (x, y) making both sides equal belongs to it, and there are infinitely many such pairs, not one fixed x and yNo, since x and y are different letters, they can't be compared to each other in the same equationYes, but only once specific values are chosen for x and y, the same way 2x + 1 = 7 is solved for one value of x

Correct.This lesson is now marked done.

Back to the lesson

Not quite.Try again, or ask for a hint.

Ask how many pairs (x, y) can pass the test, not what x equals. A fixed unknown has one value that works; a relationship has a whole line of them.

Getting it wrong does not hold you back.Back to the lesson

Algebra and geometry you can move.