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

-3c + y = -9
y = -9 + 3c

then substitute the result (-9 - -3c) into the second equation:

c - 3(-9 + 3c) = 1
c + (-3 x -9) + (-3 x 3c) = 1
c + 27 - 9c = 1
c - 9c = 1 - 27
-8c = -26
c = \( \frac{-26}{-8} \)
c = 3\(\frac{1}{4}\)

To multiply monomials, multiply the coefficients (the numbers that come before the variables) of each term, add the exponents of like variables, and multiply the different variables together.

(6a)(6ab) + (7a²)(4b)
(6 x 6)(a x a x b) + (7 x 4)(a² x b)
(36)(a¹⁺¹ x b) + (28)(a²b)
36a²b + 28a²b
64a²b

The volume of a cylinder is πr²h:

v = πr²h
v = π(2² x 1)
v = 4π

To solve this equation, repeatedly do the same thing to both sides of the equation until the variable is isolated on one side of the < sign and the answer on the other.

3a - 3 < 3 - 3a
3a < 3 - 3a + 3
3a + 3a < 3 + 3
6a < 6
a < \( \frac{6}{6} \)
a < 1

A line segment is a portion of a line with a measurable length. The midpoint of a line segment is the point exactly halfway between the endpoints. The midpoint bisects (cuts in half) the line segment.