Solve the simultaneous equations 3x + y = –4 and 3x – 4y = 6

  1. Label first equation as equation 1 and the second as equation 22) Make y the subject of the equation from equation (1); hence: eq 1 : y = -4 -3x3) Substitute the new equation into equation (2) : 3x- 4(-4-3x)=6 --> 3x+12x +16=64) Collect like terms : 15x = -10, so x = -2/3 5) Substitute calculated value of x into any of the original equations to find y, hence y= -2
MI
Answered by Munachi I. Maths tutor

2907 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

John has 12 marbles. Sandra has 10 more marbles than Kathy. Kathy has 4 times as many marbles as John. How many marbles does Sandra have?


Solve the linear simultaneous equations: 3x + 5y = 45, 2x - 9y = -7


Why do I keep getting the wrong answer when tackling percentage change questions?


Solve the simultaneous equations using the substitution method. 2y+x=8 and 1+y=2x.


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

MyTutor is part of the IXL family of brands:

© 2025 by IXL Learning