3x + 4y + 7z = 12. x=2 and y=-1, what is the value of z to 2 dp?

first you sub in the values you know so3(2) + 4(-1) + 7z =12then you simply the equation6-4+7z=122+7z=12then you put all the letter values on one side and all the numbers on the other12-2= 7zthen simplify10=7zthen put all the letter values on one side and all the numbers on the other again10/7=zthen solve for zz=1.43 (to 2dp)

Answered by Emily P. Maths tutor

2752 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Put the following in order of size, smallest first: 8/sqrt3, sqrt6*sqrt2, sqrt48-sqrt27


Solve these equations simultaneously, y= 5x - 9and, x=2y


Simultaneous questions: 2x+y=7, 3x-y=8


The diagram shows a prism. The cross-section of the prism is an isosceles triangle. The lengths of the sides of the triangle are 13 cm, 13 cm and 10 cm. The perpendicular height of the triangle is 12 cm. The length of the prism is 8 cm. Work out the total


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