Alejandro was asked to solve a system of linear equations by using the substitution method. What is the error in his work below? Step 1: 4y+x=15 -9x + 5y = 20 Step 2: 4y+x= 15 x = 15 - 4 Step 3: 4y + x = 15 4y + (15 - 4y) = 15 4y + 15 - +y = 15 There are infinitely many solutions to the system of linear equations Select one: © A. He substituted the expression he found in Step 2 back into the incorrect given equation. O B. He did not write both equations in slope-intercept form 6 C. His last step means that the system has no solution, not infinitely many solutions. O D. He chose the wrong given equation to solve for one of its variables in Step 2

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for

54.864 meters

step-by-step explanation:

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step-by-step explanation:

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