Solve the system of equations and choose the correct answer from the list of options. x − y = 7 y = 3x + 12

x=-19/2, -33/2. (-19/2, -33/2).

Step-by-step explanation:

x-y=7

y=3x+12

y=x-7

x-7=3x+12

x-3x-7=12

-2x-7=12

-2x=12+7

-2x=19

x=19/-2

-19/2-y=7

y=-19/2-7

y=-19/2-14/2

y=-33/2

a.for lorena 14 hours makes $126   for 16 hours she makes 144

for julie 6 hours makes $72 for 21 hours its $252

b. julie makes more money than lorena julie makes $12 an hour and lorena makes $9  

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