Help me plot the solution in graph

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Hung
Hung 2023-9-27
回答： Sam Chak 2023-9-27
Consider the following system of equations: 9 − 2y − x = 0; −x + 2y = 13.
Use MATLAB to solve the above system of equations. Then, plot the solution and comment on the slope and the shape of the equations.
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回答（2 个）

Walter Roberson
Walter Roberson 2023-9-27
Ran in:
A = randi([-9,9])
A = -8
B = randi([-9,9])
B = -4
C = randi([-9,9])
C = -5
fun1 = @(x,y) A*x + B*y + C
fun1 = function_handle with value:
@(x,y)A*x+B*y+C
A2 = randi([-9,9])
A2 = 1
B2 = randi([-9,9])
B2 = 7
C2 = randi([-9,9])
C2 = -1
fun2 = @(x,y) A2*x + B2*y + C2
fun2 = function_handle with value:
@(x,y)A2*x+B2*y+C2
fimplicit(fun1);
hold on
fimplicit(fun2);
hold off
The solution to the system is at the intersection of the two lines.
Sam Chak
Sam Chak 2023-9-27
Ran in:
Hi @Hung,
I'll show you another two ways of plotting the line equations.
syms x y
% specify the two line equations
eqn1 = 9 - 2*y - x == 13; % equation 1
eqn2 = 2*y - x == 0; % equation 2
Method 1: Using ezplot()
yLine1 = isolate(eqn1, y)
yLine1 = 
yLine2 = isolate(eqn2, y)
yLine2 = 
figure(1)
h1 = ezplot(yLine1, [-6, 6, -5, 3]);
h1.Color = 'blue'; hold on
h2 = ezplot(yLine2, [-6, 6, -5, 3]);
h2.Color = 'red'; hold off
grid on
title('Method 1: using "ezplot"')
Method 2: Using fplot()
soly1 = solve(eqn1, y)
soly1 = 
soly2 = solve(eqn2, y)
soly2 = 
figure(2)
fplot(soly1, [-6, 6]), hold on
fplot(soly2, [-6, 6]), grid on
xlabel('x'), ylabel('y')
title('Method 2: using "fplot"')

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