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rafi10
03.12.2021 •
Mathematics
What is the area of a triangle with a base of 1.3cm and height of 0.5 cm?
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Ответ:
0.325 cm²
Step-by-step explanation:
A =
bh =
*1.3*0.5 = 0.325 cm²
Ответ:
x = 1 , y = 1 , z = 0
Step-by-step explanation:
Add first equation to third one
-2x + 2y + 3z = 0
+
2x + 3y + 3z = 5
5y + 6z = 5 (4th equation)
Subtract second equation to first one
-2x + 2y + 3z = 0
-
-2x - y + z = -3
3y + 2z = 3 (5th equation)
Multiply 5th equation by 3
3*(3y + 2z) = 3*3
9y + 6z = 9 (6th equation)
Subtract 6th equation to fourth one
5y + 6z = 5
-
9y + 6z = 9
-4y = -4
Solve for y
-4y = -4
y = (-4)/(-4)
y = 1
Replace this value in 4th equation and solve for z
5(1) + 6z = 5
6z = 5-5
6z = 0
z = 0
Replace y and z values obtained in first equation and solve for x
-2x + 2y + 3z = 0
-2x + 2(1) + 3(0) = 0
-2x + 2 = 0
-2x = -2
x = (-2)/(-2)
x = 1