For the following system, use the second equation to make a substitution for why in the first equation. Will mark brainlyest!
1 answer:
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Answer:
5.7
Step-by-step explanation:
pythagorean theorem
A^2 + B^2 = C^2
sub in
A^2 + 7^2 = 9^2
simplify
A^2 + 49 = 81
solve
A^2 = 32
solve further
A =
use calculator and get:
5.65685
round and get:
<u>5.7</u>