Solve 9x-4y=-109 and 7x+89=y using the substitution method.

Expert Answers

An illustration of the letter 'A' in a speech bubbles

The set of equations 9x - 4y = -109 and 7x+89=y has to be solved for x and y.

Substitute y = 7x+89 in 9x - 4y = -109

=> 9x - 4(7x+89) = -109

=> 9x - 28x - 356 = -109

=> 19x = -247

=> x = -13

y = 7*(-13) + 89 = -2

The solution of the set of equations is x = -13 and y = -2

Approved by eNotes Editorial Team

We’ll help your grades soar

Start your 48-hour free trial and unlock all the summaries, Q&A, and analyses you need to get better grades now.

  • 30,000+ book summaries
  • 20% study tools discount
  • Ad-free content
  • PDF downloads
  • 300,000+ answers
  • 5-star customer support
Start your 48-Hour Free Trial