It says right there in your question a=l. So, a=l.
Now we have concluded that a=l. a equals l.
Step-by-step explanation:
4x - 3y = 1 ....... 1
3y = x - 1 ..... 2
sub 2 in 1
4x - (x -1) = 1
4x - x + 1 = 1
3x = 1 - 1
3x = 0
divide by 3 on both side
x = 0
sub the value of x in 2
3y = 0 - 1
3y = -1
divide by 3 on both sides
y = - 1/3
(x;y)
(0;-1/3)
The answer would be 60, because you will take 5 times 12. This is because there are 12 cookies in a dozen time 5 dozen.
The answer to question 4 is 5/27.