firenation18
16.10.2020 •
Mathematics
15. • Solve the simultaneous equations
x+3y=1
-x+y=3
A. 1 and 1
B.
1'and-2
2 and -2
D. 1 and 2
C.
Solved
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Ответ:
Explanation:
First, add up the equations:
x-x+3y+y=4
4y=4
y=1
Now, plug y into any of the original equations above and solve for x:
-x+1=3
-x=2
x=-2
Therefore, the answer is B. 1 and -2
Ответ: