1.5x + 4.5y = 18
• first we can see this is a linear equation since there are no terms alike.
(Meaning we won’t have just a number as our answer)
• if we are trying to find X then we must do everything else around it.
• first we have inverse operation meaning we have to subtract 4.5y from 18.
This gives us 1.5x = 18 - 4.5y
• now to get X alone we must do inverse operation again, but since it is multiplication this time we must divide.
1.5x = 18 - 4.5y
——- —————
1.5 1.5
• we now can cross off the 1.5 to give us X alone.
X = 18 - 4.5y
—————
1.5
•If we didn’t have like terms we would leave the answer like this but since we do we can simply.
The 18 and 1.5 are alike so this allows us to divide.
18 divided by 1.5 = 12
So this gives us our answer
X = 12 - 4.5y