X=y+3
2x-y=5

solve linear system using substitution, with this algebra problem?

Which approach to the theory-and-research cycle does the following sequence reflect: (1) specific observations suggest generalizations, (2) generalizations produce a tentative theory, (3) the theory is tested through the formation of hypotheses, and (4) hypotheses may provide suggestions for additional observations?

The graph below represents the number of dolphins in a dolphin sanctuary. select all the key features of this function.

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?