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Area of a Triangle Formula is
A = 1/2 abSINc
Label the sides of the triangle PR = 2x = a PQ = x = b
1/2 (x) 2x (x) x (x) SINc = A = x² SINc
Rearrange the equation to give...

Equation 1: x-2y=3Equation 2: x²+2y²=27The easiest way to do this is to put one of these equations into the other, by rearranging for either x or y. Because there are no squares to d...

To make x the subject of the formula, we simply want to have x on its own on one side of the equals sign. So we need to remove any numbers on the same side as x. A key rule to remember is that everything ...

x = (y+12)/3

Lets begin by splitting the bx term to make factorising possible: 2x² - x - 21 is the same as 2x² - 1x - 21What two numbers = -1 when added, and = -42 when multiplied together?(note ...