The dollar store

Question

the dollar store sells items for $1 into Dollars you spent $21 and bought 14 items let X stand for the number of $1 items you bought and let y stand for the number of $2 items you purchased write and solve a system of equations to find out how many of each $1 and $2 items you purchased

Answer 1

x= one dollar items

y= two dollar items

make two equations:

number of items value of items

x + y = 14 1x + 2y = 21

Use subtraction to solve

x + 2y = 21

-(x + y = 14)

y = 7

substitute 7 for y to find x

x + y = 14

x + 7 = 14

x = 7