You need to find the value of b so solve the first equation in terms of x:

-8b + x = -3
x = -3 + 8b

then substitute the result (-3 - -8b) into the second equation:

-5b - 5(-3 + 8b) = -9
-5b + (-5 x -3) + (-5 x 8b) = -9
-5b + 15 - 40b = -9
-5b - 40b = -9 - 15
-45b = -24
b = \( \frac{-24}{-45} \)
b = \(\frac{8}{15}\)

The circumference of a circle is the distance around its perimeter and equals π (approx. 3.14159) x diameter: c = π d. The area of a circle is π x (radius)² : a = π r².

The first step to solve a quadratic equation that's set to zero is to factor the quadratic equation:

z² + 15z + 54 = 0
(z + 6)(z + 9) = 0

For this expression to be true, the left side of the expression must equal zero. Therefore, either (z + 6) or (z + 9) must equal zero:

If (z + 6) = 0, z must equal -6
If (z + 9) = 0, z must equal -9

So the solution is that z = -6 or -9

A cylinder is a solid figure with straight parallel sides and a circular or oval cross section with a radius (r) and a height (h). The volume of a cylinder is π r²h and the surface area is 2(π r²) + 2π rh.

A parallelogram is a quadrilateral with two sets of parallel sides. Opposite sides (a = c, b = d) and angles (red = red, blue = blue) are equal. The area of a parallelogram is base x height and the perimeter is the sum of the lengths of all sides (a + b + c + d).