Solve the simultaneous equation: 2x + y = 18 and x−y=6

Check to see if the number in front (coefficient) of either the x's or y's is the same. In this case both the y's have the same coefficient so we do not need to make them the same.We are going to add the parts in the questions as the equations in front of y's are different (one is positive and the other is negative)2x + x = 3x and y +- y = 0 (as a + and - = -) and 18+6 = 24. Bringing it all together 3x = 24. Dividing by 3 gives x = 8.We now substitute 8 in for x in one of the equations. So 8-y=6. giving y to = 2 and x to 8.

CK
Answered by Chelsea K. Maths tutor

4176 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Prove that the difference of any two consecutive square numbers is odd


Solve: (6x + 4)/(2x - 2) + 6 = 8


Solve the following quadratic: x^2 -5x +6=0


How can I find the stationary points of a parabola given it's equation?


We're here to help

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

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences