Okay, 3x just means 3•x. so 3•x-y=15. you would have to have what x and y both mean to get the correct answer. but if they just need it simplified than your answer would be 3•x-y=15
It is easiest to simply just substitute any of the choices into the original equation and see which one satisfies the equation.
Given the equation: 3 * |5 + x| = 12
Using choice A. x = 7
3 <span>* |5 + 7| = 12
</span>36 =/= 12
Using choice B. x = 1
3 <span>* |5 + 1| = 12
</span>18 =/= 12
Using choice C. x = -9
3 <span>* |5 + -9| = 12
</span>12 = 12
Therefore, the correct answer is C. -9
Answer:
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Step-by-step explanation:
Answer:
![\$18](https://tex.z-dn.net/?f=%5C%2418)
Step-by-step explanation:
Let the cost of sheet metal per square feet be ![x](https://tex.z-dn.net/?f=x)
Amount of sheet metal bought is ![10.8\ \text{ft}^2](https://tex.z-dn.net/?f=10.8%5C%20%5Ctext%7Bft%7D%5E2)
Amount of sheet metal used is ![3.7\ \text{ft}^2](https://tex.z-dn.net/?f=3.7%5C%20%5Ctext%7Bft%7D%5E2)
Remaining value of the sheet metal is ![\$127.8](https://tex.z-dn.net/?f=%5C%24127.8)
So we get the equation
![10.8x-3.7x=127.8\\\Rightarrow 7.1x=127.8\\\Rightarrow x=\dfrac{127.8}{7.1}\\\Rightarrow x=18](https://tex.z-dn.net/?f=10.8x-3.7x%3D127.8%5C%5C%5CRightarrow%207.1x%3D127.8%5C%5C%5CRightarrow%20x%3D%5Cdfrac%7B127.8%7D%7B7.1%7D%5C%5C%5CRightarrow%20x%3D18)
So, cost of sheet metal per square feet is
.
Answer:
0 = -6
Step-by-step explanation:
Step 1: Simplify both sides of the equation.
−2(−2k+3)+4k=−2(6−3k)+2k
(−2)(−2k)+(−2)(3)+4k=(−2)(6)+(−2)(−3k)+2k(Distribute)
4k+−6+4k=−12+6k+2k
(4k+4k)+(−6)=(6k+2k)+(−12)(Combine Like Terms)
8k+−6=8k+−12
8k−6=8k−12
Step 2: Subtract 8k from both sides.
8k−6−8k=8k−12−8k
−6=−12
Step 3: Add 6 to both sides.
−6+6=−12+6
0=−6