Step-by-step explanation:
-3x - 7y = -63
-(3x + 7y) = -63
3x + 7y = -63/-1
3x + 7y = 63
Value of x
3x + 7y = 63
3x = 63 - 7y
x = (63 - 7y)/3
Value of y
3x + 7y = 63
7y = 63 - 3x
y = (63 - 3x)/7
Answer:
4h30min full rate and 1h30 min reduced rate
So, for 6h of work Liam is owed $ 9×25/2+3×18/2=225/2+32=144.5
It is A so you have it right