Solve for x and y using these simultaneous equations: 2x + 3y = 21, y = 2x - 1

Substitute y = 2x - 1 into the first equation.

2x + 3(2x -1) = 21

2x + 6x - 3 = 21

8x = 24

x = 3

Therefore y = 2(3) - 1 = 5

AL
Answered by Alexandra L. Maths tutor

2386 Views

See similar Maths 13 Plus tutors

Related Maths 13 Plus answers

All answers ▸

Solve the equation: 2x - 3 = 1/2


What is the solution to the inequality shown? 3m + 5 > 2 (m-7)


Solve the equation: 3x - 5.5 = 1/2


An amount of money is split between three people: A, B, and C. C gets 50%, B get 3/9, a) what share does A get. A has £10 b) how much does B have? C spends 90% of his money c) how much total money is left between A, B and C?


We're here to help

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

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences