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

3b + z = -7
z = -7 - 3b

then substitute the result (-7 - 3b) into the second equation:

b + 5(-7 - 3b) = -3
b + (5 x -7) + (5 x -3b) = -3
b - 35 - 15b = -3
b - 15b = -3 + 35
-14b = 32
b = \( \frac{32}{-14} \)
b = -2\(\frac{2}{7}\)

A rectangle is a parallelogram containing four right angles. Opposite sides (a = c, b = d) are equal and the perimeter is the sum of the lengths of all sides (a + b + c + d) or, comonly, 2 x length x width. The area of a rectangle is length x width. A square is a rectangle with four equal length sides. The perimeter of a square is 4 x length of one side (4s) and the area is the length of one side squared (s²).

A circle is a figure in which each point around its perimeter is an equal distance from the center. The radius of a circle is the distance between the center and any point along its perimeter. A chord is a line segment that connects any two points along its perimeter. The diameter of a circle is the length of a chord that passes through the center of the circle and equals twice the circle's radius (2r).

According to the Pythagorean theorem, the hypotenuse squared is equal to the sum of the two perpendicular sides squared:

c² = a² + b²
c² = 6² + 8²
c² = 36 + 64
c² = 100
c = \( \sqrt{100} \)
c = 10

The sum of the interior angles of a triangle is 180°:
180° = a° + b° + c°
c° = 180° - a° - b°
c° = 180° - 24° - 44° = 112°