Equation: 17 + x = 23
To solve this you would do 23 - 17 to get x
x = 6
She made the mistake in step 4
She should have divided by -2 not just 2 alone
4a-9b=22
substitute b=-2
4a -9(-2) = 22
4a +18 =22
subtract 18 from each side
4a = 4
divide by 4
a =1
Choice C
Answer:
<em><u>c2=10</u></em>
Step-by-step explanation:
8^2+6^2=c2
64+36=120
c2=square root of 120..which is 10