How can i solve this one 5 - x = 12

The altitude of a plane as it begins to descend is shown by the linear equation a = 30,000 - 1500m, where a is the plane's altitude, in feet, and m is minutes. What is the plane's altitude when m = 12?

Solve the system using substitution. y = - 6x+54 5y-x+9=0

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Tabitha's hiking distance in july was 2/5 miles she wrote the distance of 2.02 miles what error did she make?

Solve Y/5.6 = 12 for y

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Given that x and y are real numbers, find the value of x and y if (x+y) + (x-y) i=7+3i