The value of x is -2 and the value of y is -1.
Step-by-step explanation:
Step 1; The given equations are taken as
-3y -9x =21 or -9x -3y = 21, take this as equation 1
-18x +4y =32, take this as equation 2
Step 2; We multiply equation 1 with 2 and equation 2 with 1 so we can cancel out the variable x in both equations. By doing this we get
-18x -6y =42, take this as equation 3
-18x +4y =32, this is the same as equation 2
If we subtract 3 with 2, we cancel out the x variable and can calculate the value of y.
10y = -10 , y = -10/10 = -1
Step 3; Substituting this value of y in any of the previous equations we will get x's value. Here this value of y is substituted in equation 2.
-18x +4(-1) =32, -18x -4 = 32 , -18x = 36, x=-2.
So we have x = -2 and y = -1.
-5 x 2 = -10 , -3 x 1 = -3
HI,
Volume of a cylinder: V = π × r² × h
We know: h, V
We search: r
If we transform the formula:
r² = V/(π × h) so r = ✓(V/(π × h))
r² = 1 728 / 3.14 × 22
r² = 1728 / 69,08
r² ≈ 25 cm
So r = ✓25 = 5 cm
X= one dollar bills
Y= five dollar bills
X+y=60
Y=(60-x)
1x+5y=196
Substitute y
X+5(60-x)=196
X+300-5x=196
X-5x=196-300
-4x=-104
X=-104/-4
X=26
Y=34(60-26)
So, there are 26 one dollar bills
And 34 five dollar bills
