300x + 300 x plus StartFraction 500 over 7 EndFraction left-parenthesis 87.5 right-parenthesis equals 10,000.y = 10000

x = 12.5

Step-by-step explanation:

The correct question can be found in the attachment

300x + 500/7y = 10,000

Find x if y = 87.5

Substitute y = 87.5 into the equation

300x + 500/7(87.5) = 10,000

300x + 43,750/7 = 10,000

300x + 6,250 = 10,000

Subtract 6,250 from both sides

300x + 6,250 - 6,250 = 10,000 - 6,250

300x = 3,750

Divide both sides by 300

x = 3,750/300

= 12.5

x = 12.5 when y = 87.5

step-by-step explanation:

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1/4 because there is 4 grades.