Rewriting Equations to Use Substitution

Question 1

Which variable is most efficient to isolate?

Revolt · Accepted Answer

y in the first equation

Question 2

3. Solve for x: x =

Revolt · Accepted Answer

-5

Question 3

What is the solution?

Revolt · Accepted Answer

-3.5; "-6.5"

Question 4

How many solutions does this system of equations have? noneone✔ infinitely many

Revolt · Accepted Answer

✔ infinitely many

Question 5

Which systems of equations have no solutions? (Check all that apply.)

Revolt · Accepted Answer

x – y = 1, –3x + 3y = 3; –3x – y = 5, 15x = 10 – 5y

Question 6

Let y = the number of questions worth 2 points.✔ x + y = 35, 5x + 2y = 100x + y = 100, 5x + 2y = 355x + y = 35, 2y + x = 1002x + y = 100, 5y + x = 35

Revolt · Accepted Answer

✔ x + y = 35, 5x + 2y = 100

Question 7

How many problems of each point value are on the test?

Revolt · Accepted Answer

10 problems worth 5 points and 25 problems worth 2 points

Question 8

On her way to a concert, Hermione stopped at a restaurant for dinner. In her purse, she had 12 bills worth a total of $40. She had only $1 bills and $5 bills. How many $5 bills did Hermione have in her purse?

Revolt · Accepted Answer

7

Rewriting Equations to Use Substitution Answers

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