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To solve this problem we're going to use an equation. First let's write down the information that we do know.Let's use (r) for ruler and (c) for crayon.
So 7 rulers and 15 crayons cost £7 (or 700 pen...

First write out the general equation, y = mx + c where m = gradient and c = the Y-interceptFind the gradient m= change in y/change in xM= (-4,-6)/(9-4) = (-10)/(5) = -2Find c by substituting in either of ...

To expand is just to multiply out. We will multiply everything inside the bracket by everything inside so it becomes
2a x 4 + 2a x a
Then we use bidmas to get:
8a + 2a^2

Step 1) Write out the general equation of a straight line: y = mx + c where m is the gradient and c is where the line intersects the y-axis. Step 2) Find the gradient: m...

First write down any two factors of 36 (numbers that multiply together to give 36). Let's use 2 x 18. We now need to break these numbers down into prime factors. 2 is already a prime number, so we only ne...