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Firstly, let's have a look through the question to find the key words and write down any equations you might need. Perpendicular means the two lines cross and meet at a right angle, we also have an equati...

3² x 2²
Drawing a tree during explanation is very helpful.

Non calculator paper.
162 divided by 3 = 1/554 = 1/554*5 = 270

Answer: x=(y+7)/4
Workings:y=4x-7 add 7 to both sidesy+7=4x divide both sides by 4 to give the answer

You need to use Pythagoras's theorem which states that for any right angled triangle, a²+b²=c² , where c is the hypotenuse and a and b are the other 2 sides of the triangl...