An international calling plan charges a rate per minute plus a flat fee. A 10-minute call to France cost $3.19. A 15-minute call to France costs $4.29. Write and solve a linear equation to find the cost of a 12-minute call to France

Answer:$3.63Step-by-step explanation:A 10-minute call to France cost $3.19.[tex](x_1,y_1)=(10,3.19)[/tex] A 15-minute call to France costs $4.29.[tex](x_2,y_2)=(15,4.29)[/tex]Now we will use two point slope form[tex]y-y_1=\frac{y_2-y_1}{x_2-x_1}(x-x_1)[/tex]Substitute the values :[tex]y-3.19=\frac{4.29-3.19}{15-10}(x-10)[/tex][tex]y-3.19=0.22(x-10)[/tex][tex]y-3.19=0.22x-2.2[/tex][tex]y=0.22x-2.2+3.19[/tex][tex]y=0.22x+0.99[/tex]y is the cost and x is the number of minutes Now we are suppose to find cost of a 12-minute call to FranceSubstitute x = 12[tex]y=0.22(12)+0.99[/tex][tex]y=3.63[/tex]Hence the cost of a 12-minute call to France is $3.63