this makes no sense, so imma guess for u.
C
A^(-b) = 1 / (a^b)
examples : 4^(-3) = 1 / (4^3) = 1 / 64
2 + 4^(-2) = 2 + 1/(4^2) = 2 + 1/16 = 2 1/16
3 * 2^(-2) = 3 * 1 / (2^2) = 3 * 1/4 = 3/4
Answer:
d
Step-by-step explanation:
Solution by substitution method
y=7x+8
∴y-7x=8
and y=x+20
∴y-x=20
Suppose,
-7x+y=8→(1)
and -x+y=20→(2)
Taking equation (1), we have
-7x+y=8
⇒y=7x+8→(3)
Putting y=7x+8 in equation (2), we get
-x + 7x + 8 = 20
6x = 20-8
6x = 12
x= 12 / 6
x = 2
substitute for x in equation (3)
y = 7(x) + 8
y = 7(2) + 8
y = 22
8x+4 would be the answer if you combine like terms