you bought 4 bananas and 5 apples at the store for $2.50 the next day you bought 10 bananas and 3 apples at the store for $3.40. The bananas and apples had the same price both days. How much does each cost?
4b+5a=2.50 10b+3a=3.40 You multiply the equations by the variables so they can cancel out. For example the first one by 3 and the second by 5 so you have
12b+15a=7.50 50b+15a=17 Subtract them and end up with
-38b=-9.5 solve: b=0.25, substitute b in any equation and get a=0.30 Hope this helped
