Solve the systems of equations x+8y=2 2y-x=18

We pick one of the equations and isolate the y on one side.
x+8y = 22y=18+x
We express the equation 2 in terms of y, dividing it by 2.
x+8y = 2y = (18+x)/2
which is the same than
x+8y = 2y = 9 + x/2
We plug the y into the first expression, we find :
x + 8*(9+ x/2) = 2x + 72 + 8x/2 = 2x +4x = 2 - 725x = - 70x = -70/5 = - 14
We now have found that x = - 14
Lets plug it into the second equation to find y
y = 9 - 14/2y = 9 - 7y = 2
The sytem of two equations is solved!
y= 2 and x = - 14

Answered by Victoire L. French tutor

1911 Views

See similar French GCSE tutors

Related French GCSE answers

All answers ▸

Translation from English to French


How do I conjugate regular verbs in the present tense?


How do I use the imperfect in French?


why do some verbs have the word "Se" in front of them in the infinitive form?


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