$\left\{\begin{array}{ccc}2x+3y=17&\text{multiply both sides by (-2)}\\3x+6y=30\end{array}\right\\\underline{+\left\{\begin{array}{ccc}-4x-6y=-34\\3x+6y=30\end{array}\right}\qquad\text{add both sides of the equations}\\.\qquad-x=-4\qquad\text{change the signs}\\.\qquad x=4\\\\\text{put the value of x to the first equation:}\\\\2(4)+3y=17\\8+3y=17\qquad\text{subtract 8 from both sides}\\3y=9\qquad\text{divide both sides by 3}\\y=3$

5 0

3 years ago

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What is the value of z in the equation 2(4z − 3 − 21) = 166 − 46? 21 24 30 36

Nataly_w [17]

2(4z-3-21)=166-46

Combine like terms
2(4z-24)= 120

Distribute
8z-48= 120

Add 48 to both sides
8z= 168

Divide both sides by 8
z=21

Final answer: z=21

5 0

3 years ago

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Help pleaseeeeee anybody ??????

GuDViN [60]

Answer:

Step-by-step explanation:

apex

8 0

3 years ago

What is the angle of rotation of the image?A. 60°B. 90°C.120°D. 180°​

What is the angle of rotation of the image?A. 60°B. 90°C.120°D. 180°