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How do you know whether to use sin, cos or tan to find the angle in a triangle?

You have to look at the where the angle is located and what sides of the triangle relative to the angle you are given. The hypotenuse is always the longest line of the triangle, the opposite is always the si...
FA
Answered by Feranmi A. • Maths tutor
3500 Views

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

To solve the equations the first step to take is to eliminate one of the variables x or y so we can get the value of it and then substitute it back in to get the value of the other. One way to do this would ...
YB
Answered by Yunis B. • Maths tutor
4832 Views

Solve the simultaneous equations: 5x + y =21 and x - 3y = 9.

Rearrange x - 3y = 9 to make x the subject by adding 3y to both sides of the equation, giving x = 9 + 3y. Substitute the value of "x" in the second equation for "9 + 3y", giving: 5(9 + 3y...
RS
Answered by Rebecca S. • Maths tutor
17042 Views

Lily is buying theatre tickets. 4 adult tickets at £15 each 2 child tickets at £10 each A 10% booking fee is added to the ticket price. 3% is then added for paying by credit card. Work out the total ticket price if Lily is paying by card?

First we need to find out the price of the tickets without the booking fee and credit card fee.4x15=602x10=2060+20=80 (This is the price of 6 tickets without fees)Now we calculate the booking fee, which is 1...
VP
Answered by Vaiva P. • Maths tutor
4623 Views

Solve the simultaneous equation: x+2y=8 and 2x+y=10 - using a calculator

Make the x's the same in order to remove the x's from the eqn Multiply eqn (1) by 2 and keep eqn (2) the same to gain 2x+4y=16 and 2x+y=10To get rid of the x's, subtract: eqn (1) - eqn (2)4-1y = 16-10 which ...
RW
Answered by Robyn W. • Maths tutor
3851 Views