How do I solve this simultaneous equation below

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Adam
Adam 2022-9-17
评论： Torsten 2022-9-17
The question is solve this simulataneous eqaution and verify the soultion by plotting the functions in the domain -5 is less then or equal to x or is less then or equal to 5.
simulataneous equation is
x^2 +1 = y
7 - x = y
Just want to be pointed in the rigth direction because I have no idea how to do this.
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Torsten
Torsten 2022-9-17
Ran in:
And what's the problem then in MATLAB ?
syms x
f1 = x^2+1;
f2 = -x+7;
sol = solve(f1==f2)
sol = 
hold on
fplot(f1,[-5 5])
fplot(f2,[-5,5])
hold off

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回答（1 个）

Sam Chak
Sam Chak 2022-9-17
Ran in:
Hi @Adam
Verify with MATLAB:
x = roots([1 1 -6])
x = 2×1
-3 2
Can I leave you to find y as a simple exercise?

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