Anna burned 15 calories per minute running for x minutes and 10 calories per minute hiking for y minutes. she spent a total of 60 minutes running and hiking and burned 700 calories. the system of equations shown below can be used to determine how much time anna spent of each exercise.

15x + 10y =700
x + y = 60

what is the value of x, the minutes anna spent running?

a) 20

b) 40

c) 10

d) 30

Given the system of equations presented here: 2x + 4y = 14 4x + y = 20 which of the following actions creates an equivalent system such that, when combined with the other equation, one of the variables is eliminated? multiply the second equation by â’4 to get â’16x â’ 4y = â’80 multiply the second equation by â’1 to get â’4x â’ y = â’20 multiply the first equation by 2 to get 4x + 8y = 28 multiply the first equation by â’1 to get â’2x â’ 4y = â’14