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We want to make P = xy^2 into something more complicated, which only has Xs, and no Ys. 

Firstly, you need to remember that when there are two equations, the question will almost definitely involve...

Notice that the questions specifies that you should expand and simplify. This means expanding the equations is a good idea. To expand the equation, we will start by expanding each brackets.

3(x-2)-...

To find the answer to this, we can use the point-slope form. To do this: y - (-7) = 3 (x - 4) Simplified: y + 7 = 3x - 12 : y = 3x - 19

30y+15x=120

12y+15x=84

18y=36

y=2

4(2)+5x=28

8+5x=28

5x=20

x=4

When thinking about making a fraction out of two numbers you need to find a common denominator. With this example to be able to compare 180g and 3kg you need to find the common denominator between the two...