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

-8c + z = -6
z = -6 + 8c

then substitute the result (-6 - -8c) into the second equation:

3c - 5(-6 + 8c) = -7
3c + (-5 x -6) + (-5 x 8c) = -7
3c + 30 - 40c = -7
3c - 40c = -7 - 30
-37c = -37
c = \( \frac{-37}{-37} \)
c = 1

The surface area of a cube is (2 x length x width) + (2 x width x height) + (2 x length x height):

sa = 2lw + 2wh + 2lh
sa = (2 x 3 x 5) + (2 x 5 x 6) + (2 x 3 x 6)
sa = (30) + (60) + (36)
sa = 126

You can only add or subtract monomials that have the same variable and the same exponent. For example, 2a + 4a = 6a and 4a² - a² = 3a² but 2a + 4b and 7a - 3b cannot be combined. However, you can multiply and divide monomials with unlike terms. For example, 2a x 6b = 12ab.

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).

A rhombus is a parallelogram with four equal-length sides. A square is a rectangle with four equal-length sides.