Solve the simultaneous equations 3x + y = 11 and 2x + y = 8.

First identify which unknown has the same coefficient. In this case it is y.Either add or subtract the two equations to eliminate y. In this case we subtract one equation from the other (can be either). 3x + y = 11- 2x + y = 8 x + 0y = 3which is x = 3.The value of x can now be substituted into either equation to find y.3(3) + y = 11 which is 9 + y = 11. Rearranging to find y we must minus 9 from both sides of the equation to get y on its own on one side of the equation.9 + y - 9 = 11 - 9 gives y = 2.We have now solved the simultaneous equations. We can check our answer is correct by substituting the values of x and y into either original equations. For example 3(3) + 2 = 9 + 2 = 11.




Answered by Natasha C. Maths tutor

2947 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

If x^2 + y^2 = 20 and y=10 - 2x, find x and y.


Solve 5x-2=3x+11


How do you find the y-axis intercept of a straight line?


There are 10 boys and 20 girls in a class. In a class test, the mean score of the boys is 77. The mean score of the girls is 80. What is the mean score of the whole class?


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