At a local store, kelly and martin bought some notebooks and pencils. Kelly bought 4 notebooks and 25 pencils for 16.71. Martin bought 6 notebooks and 20 pencils for 21.74 what is the cost of 1 notebook and 5 pencils

Respuesta :

4x + 25y = $16.71, Kelly

6x + 20y = $21.74, Martin

-12x - 75y = $ -50.13
12x + 20y = $43.48

-55y = - 6.65

y(pencils) = $0.12

4x + 25(0.12) = $16.71
4x + 3 = $16.71
4x = $13.71

x(notenooks) = $3.43

Cost of 1 notebook and 5 pencils

x +5y = Cost

0.12 + 5(3.43) = Cost

COST = $17.27