Answer:
first thing, take 3 pairs of equations and in each pair, make any one variable's coefficient equal to the coefficient of the same variable in the other equation and subtract the equations.
you will get 3 different equations:
x+y = 1
- 4x - 21z = 72
-x + 3z = -10 (simplified)
now take the value of x and y from equation 2 and 3 in terms of z and substitute x and y with those values
y = (72 + 21z)/-4
x = 3z + 10
as x + y = 1
you will get z = -4 after sloving the equation
now you have the value of one of the variables..
now we will substitute z in the equations to get the other variables
x = 3z + 10
x = 3(-4) + 10
x = -12 + 10
x = -2
Now y:
72+21(-4)/-4
(72 - 84)/-4
-12/-4
y = 3
so,
z = -4
x = -3
y = 3
I assume that it's brainly enough
Answer:
C) 405.3 ft
Step-by-step explanation:
A triangle is a polygon with three angles and three sides. Types of triangle are scalene, isosceles, equilateral, right angled triangle.
Given a triangle with angles A, B, C and the corresponding sides directly opposite to the angles as a, b, c. The sine rule states that:
In the triangle formed by point C, ship B and ship A, we have ∠A = 82°, ∠B = 78°, c = AB = 140 ft. Hence:
∠A + ∠B + ∠C = 180° (sum of angles in a triangle)
82 + 78 + ∠C = 180
∠C + 160 = 180
∠C = 20°
Using sine rule:
a = distance from Ship B to the signal fire at point C
Answer:
C
Step-by-step explanation:
-35/3*(-21/5)=35/3*21/5=49
Answer:
n = 5
Step-by-step explanation:
Given
= ( cross- multiply )
18n = 90 ( divide both sides by 18 )
n = 5