This system of equations is consistent and independent, because there is only one solution. the answer is C
42 less then a number z....
z - 42 <== ur expression
Irratonal numbers can't be written as a/b where a and b are integers and b≠0
so if it can be written in form a/b then it is not irrational

, it's rational
1/5 is rational

it's irrational because we can't simplify the square root further
6.3=6.3/1=63/100, rationanl
answer is

is irrational
The equation would look like: p - 5.16 = 15.48
because the coupon subtracts 5.16 from p and the price you pay is 15.48
Solve the equation by adding 5.16 to both sides
p = 20.64
The original price of the shirt is $20.64
Switch the x and y values and isolate y, then simplify.
x=6y+5
6y=x-5
y=1/6x-5/6