How to solve 3 equations in Python without matrix?

Question

Hi I have 3 simple equation that I wanted to solve in python.

5x+9y=23 2x+3z=11 7x+5y+6z=35

first I wanted to solve with np.array but first two equation has 2 different unknowns. I can't find similar problems in internet and I don't know what should I use to solve this.

I know but my teacher wanted us to solve either matlab or python and I know nothing about it. And Sembei thank you very much! — Egumus, Dec 22 '22 at 13:16
you just needed to google "python solve system equations" to find the solution — Sembei Norimaki, Dec 22 '22 at 13:17
Does this answer your question? [Is there a python module to solve linear equations?](https://stackoverflow.com/questions/6789927/is-there-a-python-module-to-solve-linear-equations) — rosa b., Dec 26 '22 at 19:31

score -2 · Accepted Answer · edited Dec 22 '22 at 13:18

-2

Use np.linalg.solve and assign a coefficient of 0 to the missing unknowns

import numpy as np

A = np.array([[5, 9, 0], [2, 0, 3], [7, 5, 6]])
b = np.array([23, 11, 35])
x = np.linalg.solve(A, b)

print(x)
[1., 2., 3.]

So the solution is x=1, y=2, z=3

edited Dec 22 '22 at 13:18

ChrisGPT was on strike

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answered Dec 22 '22 at 13:14

Sembei Norimaki

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Please don't do people's homework for them. Your comment telling OP to search for documentation is a much better response. – ChrisGPT was on strike Dec 22 '22 at 13:31
well yes, but in tutorials usually they put systems with complete equations. In this case the OP was asking how to solve for systems with missing unknowns, which I explained that is solved by setting the coeff to 0 and gave an example. – Sembei Norimaki Dec 22 '22 at 13:38

How to solve 3 equations in Python without matrix?

1 Answers1