If you were to use the substitution method to solve the following system, choose the new equation after the expression equivalent to x from the second equation is substituted into the first equation.

3x + 2y = - 21

x - 3y = 4

A box contains bags of crisps. Each bag of crisps weighs 25 grams. Altogether, the bags of crisps inside the box weigh 1 kilogram. How many bags of crisps are inside the box?

Roger is training for a half-marathon. The course is 13.1 miles long. Let p represent Roger's average pace in minutes per mile. Write and solve an inequality to show the average pace needed to finish the half marathon in less than 2 hours.

In order to solve the equation - 3x - 6 = 5, the first step is to A. add 6 to both sides B. divide by 5 on both sides C. subtract 6 from both sides D. multiply by 5 on both sides (I believe it is A.)

What is the greatest common factor for 12 and 20 and 36

Mr. Martin drove 290 miles last week. This week he drove 125 miles more than last week. How many miles did Mr. Martin drive this week

Solve: (x + 5) ^2 + 15 = 64

Explain whether x + 2y + 3z is equivalent to z + y + 2 + x + y + z.

Solve for x 9/10+4/x=1

A storage shed is to be built in the shape of a box with a square base. It is to have a volume of 343 cubic feet.

What is the answer of 7 copies of the sum of 8/5 + 4