Please help(EXAM)
20 points please help

1

Step-by-step explanation:

(3/2) + 2M = (7/2)

(7/2) - (3/2) = 2M

2 = 2M

M = 1

                       

Step-by-step explanation:

First we need to write system of 2 equations with 2 variables:
x*6 + y*12.5 = 34
x+y = 3.5

for substitution we express one of variables in one of equations and put it in other equation.
x = 3.5-y

(3.5 - y)*6 + 12.5*y = 34
21 - 6y + 12.5y = 34
6.5y = 13
y = 2
x = 3.5 - y = 3.5 - 2 = 1.5

she ran for 1.5 hours and biked for 2 hours.
check:
1.5*6 + 2*12.5 = 9 + 25 = 34 = 34