Mount3bank
Answered

Welcome to Westonci.ca, your one-stop destination for finding answers to all your questions. Join our expert community now! Experience the convenience of finding accurate answers to your questions from knowledgeable experts on our platform. Experience the ease of finding precise answers to your questions from a knowledgeable community of experts.

The first equation of the system is multiplied by 4. By what number would you multiply the second equation in order to eliminate the x variable by adding?
3x-2y=4
4x+5y=28

Sagot :

HugoDaflon
Since you've multiplied the firs equation by 4 you have a 12x. So you must found a number that multiplied by the 4x in the second equation will result in -12x. Concerning that the negative signal turns the number to negative, you come to the answer -3 (Minus three)
luana
[tex] \left \{ {{3x-2y=4\ \ \ |*4} \atop {4x+5y=28}} \right. \\\\ \left \{ {{12x-8y=16} \atop {4x+5y=28}} \right.\\\\To\ eliminate\ by\ adding\ multiply\ second\ equation\ by\ -3\ to\\ obtain\ -12x\\\\ \left \{ {{12x-8y=16} \atop {-12x-15y=-84}} \right.\\+----\\Addition:\\\\ -8y-15y=16-84\\ -33y=-68\\ y=\frac{68}{33}\\ 4x=28-5y\\ x=\frac{28-5y}{4}=\frac{28-5*\frac{68}{33}}{4}=\frac{1}{4} [/tex]
Thanks for using our service. We aim to provide the most accurate answers for all your queries. Visit us again for more insights. Thanks for using our platform. We aim to provide accurate and up-to-date answers to all your queries. Come back soon. Get the answers you need at Westonci.ca. Stay informed with our latest expert advice.