Solve the simultaneous equations, x+y = 16, 5x -2y = 17
Multiply the first equation by 2 to obtain 2x+2y = 32,Then use the elimination technique and add the first equation into the second equation to get : 7x = 49 therefore divide by 7 to find x = 7 Sub this value of x into the first equation and rearrange to find y = 9
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All answers ▸A cylinder has radius 2cm and height 9cm. A cone has radius r cm and height h cm. The ratio r : h is 1 : 4. The volume of the cone is equal to the volume of the cylinder. Work out the value of r.
write log2(5) +log2(3) in its simplest form
Solve algebraically the simultaneous equations: (x^2)+(y^2) = 25 , y-3x = 13
The second term of an arithmetic sequence is 7. The sum of the first four terms of the arithmetic sequence is 12. Find the first term, a, and the common difference, d, of the sequence.