91Ó°ÊÓ

Write two terms whose sum is \(-3 x\).

Write four terms whose sum is \(2 y-6\).

Use the addition property to fill in the blank so that the middle equation simplifies to the last equation. See the Concept Check in this section. $$\begin{aligned} x-4 &=-9 \\ x-4+(&)=-9+() \\ x &=-5 \end{aligned}$$

Use the addition property to fill in the blank so that the middle equation simplifies to the last equation. See the Concept Check in this section. $$ \begin{aligned} a+9 &=15 \\ a+9+() &=15+(\quad) \\ a &=6 \end{aligned} $$

Fill in the blanks with numbers of your choice so that equation has the given solution. Note: Each blank may be replaced with a different number. $$____+x=______ : Solution: -3$$

Fill in the blanks with numbers of your choice so that equation has the given solution. Note: Each blank may be replaced with a different number. \(x-\)_____=_____ ; Solution: \(-10\)

Let \(x=1\) and then \(x=2\) in the equation \(x+5=x+6 .\) Is either number a solution? How many solutions do you think this equation has? Explain your answer.

Let \(x=1\) and then \(x=2\) in the equation \(x+3=x+3 .\) Is either number a solution? How many solutions do you think this equation has? Explain your answer.

Fill in the blank with a number so that each equation has the given solution. \(6 x=\)_____ ;\( solution: \)-8$

Fill in the blank with a number so that each equation has the given solution. \(____ x=10 ;\) solution: \(\frac{1}{2}\)