Answer:
or 
Step-by-step explanation:
Given
Required
Determine the solution
We'll solve using elimination method.
Subtract the first equation from the second:
Make x the subject:
Substitute 
for x in the first equation
Make y the subject
Hence, the solution is:
or
P=2(l)+2(w)
90=2(4w-5)+2(w)
90= (8w-10)+2w
90=10w-10
10+90=10w-10+10
100=10w
w=10
90=2(4[10]-5)+2(10)
90=2(40-5)+2(10)
90=2(35)+20
90=70+20
90=90
A branch of mathematics that uses variables is algebra
Answer:
Step-by-step explanation:
She will need 5 cups of milk because 1.25 times 4 equals to 5!
