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 both sides by 2 will give us x=(y-5)/2.Now we know in this case y is equal to 11 and when we substitute this into the equation we get x = (11-5)/2 = 6/2 = 3.Therefore when y=11, x=3
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Related Maths GCSE answers
All answers ▸A right-angled triangle has one angle size 60 degrees, and hypotenuse of length 32cm. Calculate the length of the side opposite the 60 degree angle, to 3sf.
Pythagoras' Theorem
Solve these simultaneous equations: 7x+3y=84, 2x+2y=32
A,B and C all lie on the line x^2 + y^2 = 49 where A is on the y axis, B is on the X axis and C is the mid point of the straight-line connecting A and B.