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Solve Simultaneous equations: 3x + 4y = 23 & 2x + 3y = 16

We need to cancel one of the variables (the x or y) out. Find the LCM of x or y.e.g. for x --> 6Multiply the WHOLE eqn to get 6x. So multiply the 1st eqn by 2 and the 2nd by 3[1] 6x + 8y = 46[2] 6x + 9...

EE
Answered by Eric E. • Maths tutor
3086 Views

The curve C has parametric equations x=cos(t)+1/2*sin(2t) and y =-(1+sin(t)) for 0<=t<=2π. Find a Cartesian equation for C. Find the volume of the solid of revolution of C about the y-axis.

Note the simplest relation to eliminate t is the fact cos2(t)+sin2(t)=1 for all t, so we need only find x and y in terms of cos(t) and sin(t).Note we have sin(t)=-(y+1) from the equa...

LP
4803 Views

How do vaccines prevent certain diseases?

Vaccines introduce a dead, inactive or altered form of a pathogen (a microbe that causes an infectious disease) into the body. These pathogens have antigens,

AM
Answered by Alice M. • Biology tutor
2628 Views

What is a vector?

A vector describes a movement from one point to another.a column vector shows both the direction and the magnitude of this movement.the top number describes the horizontal movement.the bottom number descr...

TH
Answered by Tom H. • Maths tutor
5197 Views

1) What is the area of a rectangle? 2) What is the area of a triangle?

  1. The area is found by doing length x width. (this can be taught by using squared paper and counting the squares in a shape.2) the area of a triangle is found by using the equation 1/2 x base x height...
TH
Answered by Tom H. • Maths tutor
2127 Views

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