How to solve this equation?

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Steve
Steve 2015-1-25
回答： Steve 2015-1-25
Hi there,
This should be an easy question but somehow it doesn't work...
How can I solve this using matrices?
3x-2y=17 5x+3y=3
Thanks for any solutions!

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采纳的回答

Matz Johansson Bergström
编辑：Matz Johansson Bergström 2015-1-25
This is actually very simple using the \ operator, see mldivide,\ documentation
A = [3, -2; 5, 3];
b = [17, 3]';
A\b
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Matz Johansson Bergström
Matz Johansson Bergström 2015-1-25
编辑：Matz Johansson Bergström 2015-1-25
Also, we can easily verify that it is correct
x = 0:5;
y1 = (3*x - 17)/2;
y2 = (-5*x + 3)/3;
close all
hold on
plot(x, y1, 'k', 'linewidth',2)
plot(x, y2, 'b', 'linewidth',2)
A = [3, -2; 5, 3];
b = [17, 3]';
xy = A\b % solve Ax=b for x
plot(xy(1), xy(2), 'Or', 'linewidth', 4) %the solution

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更多回答（1 个）

Steve
Steve 2015-1-25
Great thank you! You helped me a lot! =)

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