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Solve the following simultaneous equations: 3x + 5y = -4 and -2x + 3y = 9

Label the equations 1 and 2 We want to make it so the x are the same number - therefore we have to find a common multiple of 2 and 3 - this is 6 Therefore the equations turn into: 1) 6x + 10y = -8 2) -6x + 9...
KP
Answered by Krishnaa P. • Maths tutor
5713 Views

What is 17% of 84?

We know that 17% is the same as 17/100 or 0.17 so we do 0.17*84 = 14.28.
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Answered by Chris B. • Maths tutor
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How do you solve quadratic equations?

A typical GCSE question will give you an equation in the from ax 2 + bx + c, x 2 - 8x + 15 = 0 for example, and ask you to solve the possible value of X. To do this we need to split the equation into two hal...
TD
Answered by Tutor55115 D. • Maths tutor
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How do you solve the following simultaneous equations? Equation 1: 2x + 3y = 13 Equation 2: 3x - y = 3

There are various ways to solve simultaneous equations. The two easiest are by elimiation and by substitution. By Elimation When solving by elimination you want to ensure that you only have one variable (x o...
LS
Answered by Luke S. • Maths tutor
9505 Views

What actually are sin, cos and tan?

This is a common question asked by my students when they first learn about trigonometry. First draw a unit circle on the plane and the graphs of sine and cosine next to it. The circle obviously has 360 degre...
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Answered by Leon P. • Maths tutor
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