Apnswer:
p = 1
q = -2
Step-by-step explanation:
5p - 2q = 9 eqn 1
3p + 2q = 7 eqn 2
subtract equation 2 from 1
2p = 2
Substitute for p in equation 1
5(1) - 2q = 9
5 - 2q = 9
-2q = 4
Answer:
$40 ; $43.20
a) 50 * (1 - .20) = 50 * .8 = 40
b) 50 * (1 - .20) * (1 + .08) = 43.20
c) The sales tax increases the price from a by 8%
I think the 57 is an whole number.
