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Solve for x : 2x-15=-2x-7

Bring the x terms onto one side of the equation, and the numbers onto the other, rearranging to get 4x=8divide both sides by 4 to get x=2check answer by subbing x=2 into the equation, such that -11=-11
JP
Answered by Jack P. • Maths tutor
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Solve these simultaneous equations and find the values of x and y. Equation 1: 2x + y = 7 Equation 2: 2x - y - 4 = 4 – x

Simultaneous equations are two equations with two unknowns. And they can be solved by either elimination or substitution method.For this example, we will use the elimination method. First of all to make it e...
AC
Answered by Ashwin C. • Maths tutor
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What is differentation and how does it work?

Differentiation is how to find the gradient of a line. For example, the line y = 3x has a gradient of 3. Similarly, y = 4x + 2 has a gradient of 4. However, for most lines, the gradient isn't the same along ...
TP
Answered by Thomas P. • Maths tutor
4613 Views

How do you factorise quadratic equations?

Any quadratic equation, that is, an equation of the form ax 2 +bx+c=0, can be factorised , which means it is broken down into its linear factors . This means it will be of the form (x+m)(x+n). (We'll only co...
AB
Answered by Andrew B. • Maths tutor
3631 Views

How do I 'simplify' a surd?

Simplifying a surd means to express it using smaller numbers, making it easier to use in calculations. There are a couple of facts you will need to learn about surds, these are, 1) sqrt(a x b) = sqrt(a) x sq...
JZ
Answered by Joanna Z. • Maths tutor
5844 Views