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

Answered by Daniaal A. Maths tutor

3331 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Solve the following simultaneous equations to obtain values for x and y: 2x + y = 7 & 3x - y = 8.


(a) Expand and simplify (x − 3)(x + 5), ..2 marks.. (b) Solve x^2 + 8x − 9 = 0 ..3 marks..


The probability of obtaining heads on a biased coin is 0.4. The coin is tossed 600 times. Write down the mean number of heads and the standard deviation of the number of heads.


is x + x equal to x^2 ?


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo
Cookie Preferences