Question

math journal write a real - world situation that matches the expression 10y - 3. then evaluate the expression for y = 4. explain the meaning of the result in terms of the real - world situation.

Explanation:

Step1: Substitute y = 4 into the expression

Substitute y = 4 into 10y - 3. We get $10\times4-3$.

Step2: Perform multiplication first

According to the order of operations (PEMDAS), we first do the multiplication. $10\times4 = 40$, so the expression becomes $40 - 3$.

Step3: Perform subtraction

$40-3=37$.

For the real - world situation: Suppose you are buying some items. Each item costs $10$ dollars and you have a coupon for $3$ dollars off. If you buy $y$ items, the total amount you pay is given by the expression $10y - 3$. When $y = 4$ (you buy 4 items), you first calculate the cost of 4 items which is $10\times4=40$ dollars, and then subtract the 3 - dollar coupon. So you pay 37 dollars.

Answer:

When $y = 4$, the value of the expression $10y - 3$ is 37. The real - world situation could be the cost of buying items with a coupon as described above.