Which is an equation? A. 45/x B. 20x = 200 C. 17 + x D. 90 − x

20x=200

An equation has an equals sign

an expression does not

in the attachment.   i didn't see your choices.   the word which means there is choices.

step-by-step explanation:

(x,y)

x tells you how much left or right you go from the origin

y tells you how much down or up you go from the origin

so for example (-3,2), you go left 3 and up twice. i denoted which of the ordered pairs is which in my graph.