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The line l is a tangent to the circle x^2 + y^2 = 40 at the point A. A is the point (2,6). The line l crosses the x-axis at the point P. Work out the area of the triangle OAP.

Firstly to work out the area of the triangle OAP we need to know the coordinates of the individual points O, A and P. O is the centre of the axis hence has coordinates (0,0). The coordinates of the point A h...
MQ
Answered by Mohammad Q. • Maths tutor
8039 Views

Solve the simultaneous equations: 2x-y=x+4; x^2+4y^2=37

taking equation 1 and solving for x: 2x-y=x+4 x-y=4 x=y+4 Sub our new equation into equation 2 from the question: (y+4) 2 +4y 2 =37 Expand and simplify: y 2 +8y+16+4y 2 =37 5y 2 +8y-21=0 Factorise: (5y-7)(y+...
AW
Answered by Alexander W. • Maths tutor
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A line passes through coordinates (-2,4) and (8,9). Does the point with coordinates (32,55) fall on this line?

To work out if a given point with coordinates (X,Y) falls on a line you must work out the equation for the line. All straight lines follow the formula: y=mx+c with 'y' being the Y coordinate, 'x' being the X...
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Answered by Nicholas S. • Maths tutor
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Find x: 4x + 7 = 27

4x + 7 = 27 4x = 20 x = 5
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Answered by Saskia P. • Maths tutor
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Solve x^2=4(x-3)^2

To solve this equation we need to expand the right hand side to get: x^2 = 4(x^2-6x+9), then we multiply whats in the bracket by 4 to get: x^2 = 4x^2 - 24x +36. We can subtract x^2 from both sides to give: 3...
KF
Answered by Kelsi F. • Maths tutor
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