Patty’s Burgers sells three hamburgers and two milkshakes for three dollars and thirty five cents. One hamburger and one milkshake cost one dollar and thirty cents. Find the cost of a hamburger. I got 89 cents but its not working

1 answer

3h + 2m = 3.35
h + m = 1.30 ---> m = 1.3-h

back in the first:
3h + 2(1.3 - h) = 3.35
3h + 2.6 - 2h = 3.35
h = .75 , m = .55

Wow, time to update those textbooks from the 1950's