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Step 1) 2x + y = 18 (a) Step 2) x - y = 6 (b) Step 3) using (a): y = 18 - 2x (c) Step 4) using (b): y = x - 6 (d) Step 5) Combine (c) and (d): 18 - 2x = x - 6 (e) Step 6) Rearange (e) to find x: 3x = 24 -...

FactoriseFactorise FullyExpandSimplifyExpand and Simplify

if x and y are in a ratio 3:2 you can write it as 3x=2y so if you are given a value for either you substitute it into this and rearange to get the other value. e.g y = 2 what is x? 3x=2(2) so 4=3x, x=3/4....

(x+a)^2+(y+b)^2=c a is the a negative of the x coordinate of the centre b is the negative y coordinate. c is the seared radius.

3x^2+2x-5=4x-2 3x-2x-3=0 3(x^2-2/3x-1/3)=0 3((x-2/6)^2-4/36-1/3)=0 3(x-2/6)^2-1/3-1=0 x=2/6(+-)(4/9)^-2