Expression: -(4x-5)+2C%-is) Choose X-1
Expression-2x - 5
Choose x= -1
Step 1:
Choose a value
of x
Step 2
Substitute
Step 3: Evaluate
-(4(1)-5)+2(1-3)
--2-1)-5
-(4(1)-5)+2(1-3) --(-1)+2(-2)
1-2(-1)-5-2-5
--3
-3
Since 3 = -3, the two expressions are equivalent.
Step 4
Compare
Which explains whether Sophia is correct?
She is correct because the value of the two expressions are the same in Step 3.
She is correct because she substituted opposite values in Step 1.
She is not correct because she did not substitute the same number in both expressions in Step 1.
She is not correct because she did not perform the correct order of operations in Step 3.
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Mrs. julien’s and mrs. castillejo’s classes are selling cookie dough for a school fundraiser. customers can buy packages of macadamia nut chip cookie dough and packages of triple chocolate cookie dough. mrs. julien’s class sold 25 packages of macadamia nut chip cookie dough and 30 packages of triple chocolate cookie dough for a total of $221.25. mrs. castillejo’s class sold 5 packages of macadamia nut chip cookie dough and 45 packages of triple chocolate cookie dough for a total of $191.25. (a) write the system of equations that model the problem. be sure to explain which equation represents which situation. (b) find the cost of each type of cookie. show your work. (c) explain which method you used to solve the system and why you chose that method.