Which of the following equations shows how substitution can be used to solve the following system of equations? {=2+32+5=3
{y=2x+32x+5y=3

2x + 5y = 2x + 3

2(2x + 3) +5y = 3

2x + 5(2x + 3) = 3

y = 3

linearly: 8560 bacteria

exponentially: approximately 75233 bacteria

step-by-step explanation:

assuming it is not exponential (we would have some really complicated logarithms), let's say it is linear. then, after 5 hours, it increased by 1200 bacteria, so every hour it increases by 240 bacteria. this means that after 19 hours, we get 19 * 240 + 4000 bacteria or 3800 + 760 + 4000 = 7800 + 760 = 8560 bacteria.

because it says round your answer, i will do this exponentially (with a calculator, of course). first, we need to find how much it multiplies by every hour, by taking the 5th root of 52/40 or 13/10. this is approximately 0.167. we still need to add 1 to this, because we are multiplying by that number, not adding that amount of the number. now, we just calculate 4000 * (1.167)^19. use a calculator to get approximately 75232.6, or 75233.

answer: 1) twenty-seven times y

              2) twenty-seven multiplied by y

g

step-by-step explanation: