Question

66. Choose any method to solve the following system:
3x+7y=4
y = -1/3 x

Answer 1

Answer: x=6
Y=-2
Please refer to picture for explanation

Answer 2

x=6 and y= -2

Solution Given:

3x+7y=4

y=-⅓x

I will choose substitution method to solve

substituting value of y in equation. 3x+7y=4,we get

3x+7*-⅓x=4

3x-7x/3=4

taking LCM

(3x*3-7x)/3=4

(9x-7x)/3=4

doing criss cross multiplication

2x=4*3

x=12/2=6

substituting value of x in equation

y=-⅓*6=-2

x=6 and y= -2