When is substitution a useful method for solving systems of equations?

A truck is painting traffic lines along a highway. The truck paints 8 miles of lines in 3 hours. At that rate, how many miles can the truck paint in 12 hours?

One positive number is 7 times another positive number. the difference between the two numbers is 24. find the two numbers.

Solve the formula below for the specified variable. P=2L+2W P = 2 L + 2 W, for W a) W=P-L2 b) W=P-2L2 c) W=P-2L d) W=P-L

how to solve for 6 square root of 5

The expression - 5+20 factored is

What is m. 8 (3+7m) = 360

28 to 23 is what percent decrease?

A waiter in a restaurant places two rectangular dining tables side by side as shown in the figure. What is the perimeter of the top surface formed by joining the two tables? A. 38.5 feet B. 49 feet C. 42 feet D. 35 feet

Two numbers differ by 30. If 15 is added to the smaller, the result exceeds half the larger number by 7 1/2. What are the numbers

Is the graph of 6x2 - 2y = 7 a line? Explain.