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y=2x+5, calculate x when y=11

So what we need to do is work out what x is when y is equal to 11.Firstly, we would rearrange the equation so that x is the subject and to do this we subtract 5 from both sides.Thisgives us y-5 =2x. Dividing...
DA
Answered by Daniaal A. • Maths tutor
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Why can’t you use the quadratic formula for every quadratic?

For most Quadrátics in the form of ax^2+bx+c=0there is atleast 2 solutions in most cases as the graph of the quadratic passes the x axis on most cases. But In some cases the quadratic graph doesn’t Cross the...
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Answered by Carlos G. • Maths tutor
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f(x)=x^2+12x+32=0, solve for x

Method 1: Quadratic formulaf(x)= ax 2 +bx+c, therefore a=1, b=12, c=32 - quadratic formula= (-b+/-(b 2 -4ac) 1/2 )/2ax=(-12+(144-128) 1/2 /2 = -4 or x=(-12-(144-128) 1/2 )/2 = -8 Method 2: FactoriseWe need t...
Answered by • Maths tutor
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solve this simulatneous equations (with clear algebraic working) : 5x-2y = 33 , 5x + 8y = 18

5x -2y = 33 (substract) 5x + 8y = 18 -10y = 15 y = -1.5 5x + 8(-1.5) = 18 5x = 30 x= 6
LE
Answered by Lara E. • Maths tutor
5227 Views

Solve the follow simultaneous equation:4x + y= 4 and 2x + y= 8

4x + y= 42x + y = 8 y= 4-4xy= 8 -2x4- 4x = 8 -2x-4 = 2xx= -2y= 12
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Answered by Aatifa K. • Maths tutor
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