5(x)+10(12-x)=100
5x+120-10x=100
-5x=-20
5x=20
x=4(no of 5dollar bills)
12-4=8(no of10dollar bills)
Anna has 12 bills in her wallet, some $5 and some $10. The total value of the bills is $100. HOw many of each bill odes Anna have?
How do i solve these type of problems my quess was this but i don't know if i'm correct.
5(x) + 10(y) = 100
5(0) + 10y = 100
10y = 100
--- ---
10 10
y = 10
5(x) + 10(10) = 100
5x + 100 = 100
-100 -100
5x = 0
--- ---
5 5
x = 0
to check is :
5(0) + 10(10) = 100
0 + 100 = 100
100 = 100
you have the intercepts ok.
but its asking about how many of each so is my answer correct or what am i doing wrong.
1 answer
1 answer