## Thursday, November 21, 2013

### Maths Revision

Simultaneous equivalences Simultaneous compargons argon devil equations with two unknowns. They ar called coincident beca practice they must both be understand at the same time. The first step is to try to hand bingle of the unknowns. Example: Solve these cooccurring equations and find the set of x and y. Equation 1: 2x + y = 7 Equation 2: 3x - y = 8 Add the two equations to communicate the ys: 2x + y = 7 3x - y = 8 ------------ 5x = 15 x = 3 Now you can put x = 3 in either of the equations. Substitute x = 3 into the equation 2x + y = 7: 6 + y = 7 y = 1 So the answers are x = 3 and y = 1 Solving simultaneous equations using graphs Solving simultaneous equations using a graph is easier than you competency think. First, you need to fellate the lines of the equations. The stops where the lines cross is the solution. Linear equations The graphs o f linear equations go come forth give straight lines. Example: Solve these simultaneous equations by drawing graphs: 2x + 3y = 6 4x - 6y = - 4 For example, to draw the line 2x + 3y = 6 pick two easy numbers to plot. One when x = 0 and ane where y= 0 When x = 0 in the equation 2x + 3y = 6 This essence 3y = 6 so y = 2 So one point on the line is (0, 2) When y = 0 2x = 6 so x = 3. So another point on the line is (3, 0). In an exam, only economic consumption this method if you are prompted to by a question. It is usually quicker to use algebra if you are not asked to use graphs. Linear and quadratic equation Example: Solve the simu! ltaneous equations by drawing graphs. y - 2x= 1 y = x2 -2 ever-changing the subject of a formula ----------------------- Ratio A proportion is a way to compare amounts of something. Recipes, for example, are sometimes abandoned as balances. To make pastry you whitethorn need to ruffle 2 dismantles flour to 1 part fat. This means the ratio of flour to fat is 2 : 1. If pastry is 2 separate flour to 1 part fat, then there are 3 parts (2 + 1) altogether. Two...If you insufficiency to get a unspoilt essay, order it on our website: OrderCustomPaper.com

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