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3 years ago

Craig writes 3x + 5y - x - 4y = 3 +9y. Can you spot the 2 mistakes he has made?

Mathematics

2 answers:

fenix001 [56]3 years ago

6 0

Answer:

first 5y-4y does not equal 9y.

second 3x-x is 2x but he put 3.

Step-by-step explanation:

Math - Answered Sun.Sept.19.2021

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sattari [20]3 years ago

4 0

craig forgor how subtraction works

mistake 1: instead of doing 3x - x, he did like multiplication and also forgor about the negative sign and somehow got 3.

mistake 2: instead of doing 5y - 4y, he did 5y + 4y

if he did it right, the answer would be 2x + y

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AleksAgata [21]

Answer:

$y = \frac{5000r}{3} -50$

Step-by-step explanation:

Represent the SAT score with y and the rate with r.

So, we have:

$(r_1,y_1) = (90\%,1450)$

$(r_2,y_2) = (69.6\%,1110)$

Required

Determine the equation in slope intercept form

First, we calculate the slope

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This gives:

$m =\frac{1110 - 1450}{69.6\% - 90\%}$

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Convert percentage to decimal

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Open Bracket

$y - 1450 = \frac{5000r}{3} - \frac{5000}{3}*90\%$

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Make y the subject

$y = \frac{5000r}{3} - 1500+1450$

$y = \frac{5000r}{3} -50$

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Craig writes 3x + 5y - x - 4y = 3 +9y. Can you spot the 2 mistakes he has made?​

Craig writes 3x + 5y - x - 4y = 3 +9y. Can you spot the 2 mistakes he has made?