Simultaneous equations - Find the values of y and x: 3

3x + 5y = 19 and4x - 2y = -18Find the common multiple for 3x and 4x to enable it to be cancelled out. In this case it would be 124(3x + 5y) = 4(19) 3(4x - 2y) = 3(-18) 12x + 20y = 76 12x - 6y = -54 12x + 20y = 76- 12x - 6y = -54 12x - 12x = 0; 20y - (-6y) = 26y; 76 - (-54) = 130Therefore, 26y = 130y = 130/26y = 5Therefore,3x + 5y = 193x + 5(5) = 193x +25 = 193x = 19 - 253x = -6x = -6/3x = -2Therefore, y = 5 and x = -2

ZU
Answered by Zyen U. Maths tutor

2993 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

0.15^2 x (1-0.15)^3 to 2 s.f


Find the coordinates of the turning point of the curve y=x^2+3x+7


Write x^2 – 10x + 12 in the form (x – a)^2 + b , where a and b are integers.


Out of a sample of 80 batteries, 3 are faulty. What percentage of the batteries are faulty?


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