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mobslayer88
11.10.2019 •
Mathematics
How to solve it and get the answer
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Ответ:
3x + 2y + 10z = 195(2)
-x - y - z = -31(3)
You can solve these by elimination:-
First add equations (1) and (3) to eliminate x:-
y + 2z = 42(4)
Now multiply equation (1) by -3:-
-3x - 6y - 9z = -219 Now add this to equation (2) this gives:-
-4y + z = -24(5)
multiply this by -2:-
8y - 2z = 48(6) Now add this to equation 4 to eliminate z:-
9y = 90
y = 10
and from equation 4:-
10 + 2z = 42
2z = 32
z = 16
Now to find value of x plug in y = 10 and z = 16 into equation (1):-
x + 2(10 + 3(16) = 73 giving x = 73 - 20 - 48 = 5
Answer is x = 5, y = 10 and z = 16
Ответ:
Step-by-step explanation:
floor = 12*10= 120 sq ft
rug = r² = 9 Пr2
120-9π = 91.74 sq ft