Question

solve the system of equation 11x+15y+23=0 and 7x-2y-20=0​

Answer 1

Answer:

11X+15Y +23=0----------(1)

7X-2Y-20=0--------------(2)

NOW,

7(11X+15Y+23=0)

77X+105Y +161=0

77X+105Y= -161-------------(3)

11 (7x-2y-20=0)

77X -22Y-220=0

77X-22Y=220----------(4)

SOLVING 4 FROM 3

77X+105Y= -161

77X-22Y= +220

0 +127Y= -381

Y= -381

127

Y=3

THEREFORE PUT THE VALUE OF Y IN EQUATION 3

77X+105Y= -161

77X +105 (3)= -161

77X +315= -161

77X = -161 -315

77X = -476

X= -476

77

X= -6.2