exam Maths Puzzle Numerical Ability

step functions i dont understand

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Assume that the number of viruses present in a sample is modeled by the exponential function "f(t) 10^t," where t is the elapsed time in minutes. How would you apply logarihm to determine when the sample will grow to 5 billion viruses? 9x-4y=8
4y-9x=-8
consistant or inconsistant
dependant or independant

What is the solution of the system of equations
a. infinetly many solutions
b. a point
c. no solution