Question

Solve by substitution or elimination method. 3x - y=7;2x+5y+7=2

Answer 1

The final answer of x and y "40/21" and "-9/7"

Step-by-step explanation:

$\ Given \ value:\\\\3x - y=7 \\\\ 2x+5y+7=2 \\\\\ Find:\\\\x= ?\\\\y=?\\\\\ Solution:\\\\ \ Solve \ equation:\\\\2x+5y+7=2 \\\\2x+5y= -5.....(ii)\\\\ 3x - y=7....(i) \\\\ \ In \ Equation \ (i) \ we \ multiply \ by \ 2 \ and \ in$$\ equation (ii) \ multiply \ by \ 3$

$\ Then \ subtract \ the \ value \\\\6x-6y=42\\\\6x+15y=-15\\\\\ subtract\\\\-21y=27\\\\y= \frac{-9}{7}\\\\\ put \ the \ value \ of \ y \ in \ equation \ (i) \\\\\ equation:\\\\ 3x-\frac{-9}{7}=7 \\\\3x+\frac{9}{7}=7 \\\\3x= 7-\frac{9}{7} \\\\3x= \frac{49-9}{7} \\\\3x= \frac{40}{7} \\\\21x= 40\\\\x= \frac{40}{21}$

Learn more:

• Find the value: brainly.in/question/16434972#