Solve the system by substitution.
1 answer:
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In this case we can propose a rule of three:
$ 18 ---------------> 100%
x --------------------> 25%
Where x represents the discount made to the pillow:
So we have the new price (with the discount) is:
In addition, if 25% is discounted we have to, the price of the pillow is 75% of the original price. That is to say:
Answer:
Option A
Option D
Try this option, modify design according to local requirements.
y squared equals x squared minus z squared.
Solution:
The given triangle is a right angled triangle.
Hypotenuse = x, Base = y, Height = z
Using Pythagoras theorem, we can find the lengths of the sides of the right triangle.
Pythagoras theorem:
In right triangle, square of the hypotenuse is equal to the sum of the squares of the other two sides.
Subtract from both sides of the equation.
Switch the sides
y squared equals x squared minus z squared.
Hence Option B is the correct answer.