John bought an iPad for $425.His total price was $450.50 when he checked out at the register.What percent sales tax did he pay?
2 answers:
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Answer:
-7
Step-by-step explanation:
Lets assume the number Peggy is thinking of be "x".
Now as given, when twice the number is added to three times one more than the number. We can write it as
∴ --- Equation 1
Again, it is given that Peggy gets the same result as when she multiplies four times one less than the number.
∴ -- equation 2
Next, we can equate both the equation 1 and 2 as it is given that result is same.
Let´s distribute 3 into and 4 into
⇒
⇒
Subtract both side by 4x and 3
∴
∴ Peggy was thinking of -7
Answer:
Step-by-step explanation:
Write the system
Solve by Elimination.
multiply the second equation by -3.
Add the Equations.
Plug this back in one of the equations.