Answer:
Step-by-step explanation:
Answer:
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Step-by-step explanation:
if x is the bigger num and y is the smaller
x + y = 91
x - 3y = 7.7
multiply by -1
x+y = 91
-x + 3y = -7.7
add the equations
4y = 91 - 7.7
4y = 83.3
y = 20.825
then x+y = 91 use to find x
x+20.825 = 91
x = 70.175
the two numbers are 70.175 and 20.825
C/4 - 2c = 5/4 - c/2......multiply everything by 4
c - 8c = 5 - 2c
-7c = 5 - 2c
-7c + 2c = 5
-5c = 5
c = -5/5 = -1