Alexa pays 7/20 of a dollar for each minute she uses her pay-as-you-go phone for a call, and 2/5 of a dollar for each minute of data she uses. this month, she used a total of 85 minutes and the bill was $31. which statements are true? check all that apply.
the system of equations is x + y = 31 and 7/20x+2/5y=85
the system of equations is x + y = 85 and 7/20x+2/5y=31
to eliminate the y-variable from the equations, you can multiply the equation with the fractions by 5 and leave the other equation as it is.
to eliminate the x-variable from the equations, you can multiply the equation with the fractions by 20 and multiply the other equation by -7.
a-she used 25 minutes for calling and 60 minutes for data.
b-she used 60 minutes for calling and 25 minutes for data.
c-she used 20 minutes for calling and 11 minutes for data.
d-she used 11 minutes for calling and 20 minutes for data.