Two groups of people order food at a restaurant. one group orders 4 hamburgers and 7 chicken sandwiches for $34.50. the other group orders 8 hamburgers and 3 chicken sandwiches for $30.50. find the cost of each item. write and solve in an system of equations using elimination

step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15

b.

step-by-step explanation:

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