Write an equation for the linear function and use it to answer the given question. 9) Normaltown High School's pool record for the 100-yard freestyle was 47.8 in 1990. Assume that
the record falls at a constant rate of 0.03 second per year. What does the model predict for the
record in 2010?
A) R = 47.8 -0.03t; 47.20 seconds
B) R = 47.8t + 0.03;956.03 seconds
C) R = 47.8t - 0.03; 955.97 seconds
D) R = 47.8 +0.03t; 48.40 seconds

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step-by-step explanation:

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a

step-by-step explanation:

given the 2 equations

- x + y = - 2 → (1)

2x - 3y = 4 → (2)

multiplying (1) by 2 and adding to (2) will eliminate the x- term

- 2x + 2y = - 4 → (3)

add (2) and (3) term by term

(2x - 2x) + (- 3y + 2y) = (4 - 4), simplifying gives

- y = 0 ⇒ y = 0

substitute y = 0 in either of the 2 equations for corresponding value of x

substituting in (2) gives

2x = 4 ( divide both sides by 2 )

x = 2

solution is (2, 0 ) → a