Let:
x = Chemistry textbooks sold
y = Physics textbooks sold
The textbook store sold a combined total of 260, so:
The number of chemistry books sold was three times the number of physics textbooks sold, so:
Replace (2) into (1):
Replace the value of y into (2):
Answer:
Step-by-step explanation:
-10.6*0.5=m+11.7
-5.3=m+11.7
-5.3-11.7=m
-17=m
14.2=2(-5.8+t)
14.2=-11.6+2t
14.2+11.6=2t
25.8=2t
25.8/2=t
12.9=t
Credit
D.5/14
Because 4 appeared five times over the total
70
Step-by-step explanation i subtracted but im not good at math so dont take my word for it
The answer to your question is 130.