What does it mean when a mineral has a definite chemical composition? select 2 choices.
it always occurs in pure form.
it always contains certain elements,
it cannot form from living or once living materials.
it always contains elements in definite proportions,
it cannot contain atoms from more than one element.

It always contains certain elements and it always contains certain elements in definite proportions.

Step-by-step explanation: A mineral has five characteristics which definite chemical composition is one of them so are natural occurring, inorganic, solid and ordered internal structure.

(x, y)→(x − 8, y − 7)

step-by-step explanation:

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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.