Answered

Westonci.ca is the best place to get answers to your questions, provided by a community of experienced and knowledgeable experts. Join our platform to get reliable answers to your questions from a knowledgeable community of experts. Connect with a community of professionals ready to help you find accurate solutions to your questions quickly and efficiently.

it say solve by substitution
-x+2y=-7
-2x-6y=-14

Sagot :

Lilith
[tex]\begin{cases} -x+2y=-7\ \ |\ subtract\ 2y\ to\ both\ sides \\ -2x-6y=-14 \end{cases}\\\\\begin{cases} -x =-2y-7\ \ | \ multiply\ both\ sides\ by\ (-1) \\ -2x-6y=-14 \end{cases}\\\\\begin{cases} x = 2y +7 \\ -2x-6y=-14 \end{cases} \\ \\substitution \\ \\ -2 \cdot(2y +7 ) -6y=-14 \\ -y -14 -6y=-14 \\-7y-14=-14\ \ | \ add\ 14\ to\ both\ sides \\ -7y=0\ \ | \ divide \ both \ sides\ by\ (-7) \\y=0\\\\ x = 2 \cdot 0 +7 \\x=7 \\\\Answer : \ \begin{cases}x=7 \\ y=0 \end{cases} [/tex]
Thanks for using our platform. We're always here to provide accurate and up-to-date answers to all your queries. Thank you for visiting. Our goal is to provide the most accurate answers for all your informational needs. Come back soon. We're dedicated to helping you find the answers you need at Westonci.ca. Don't hesitate to return for more.