Solve this system of equations using the addition method.
4a - 5b = 7
4a + 5b = 17
type the correct answer in ordered pair form

Aresearch company wants to test the claim that a new multivitamin to improve short term memory. state the objective of the experiment, suggest a population, determine the experimental and control groups, and describe a sample procedure.

How do you use the elimination method for this question? explain, because i really want to understand!

Ineed to know the ordered pairs for this equation i need the answer quick because it’s a timed test