You use substitution to solve a system of equations and, after simplifying the equations, end with an expression that says 0=4. What does that say about the lines and about the number of solutions to the system?

Step-by-step explanation:

That says the system is "inconsistent", so the lines are parallel, and the number of solutions is zero.

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The attachment has an example of such a system.

walter needs to make at least 5 more cookies but no more than 40. 5 ≤ x ≤ 40

step-by-step explanation:

20 ≤ x + 15 ≤ 55

subtract 15 from all parts

20-15 ≤ x + 15-15 ≤ 55-15

5 ≤ x ≤ 40

this means how many more cookies he has to make

walter needs to make at least 5 more cookies, but no more than 40 cookies; 5 ≤ x ≤ 40

4 puzzles in 3 hours

step-by-step explanation: