Question

Please solve the question 18 and 20 plsssssssaa.....

Answer 1

18th solution :
given equation
$0.05x + 0.2y = 0.07 \\ 0.3x - 0.1y = 0.03$multiplying equation with 2 and solving for x we get x = 0.01
now substitute x = 0.01 in equation 2 , we get y = 0.34