3y + 9=3x y=-1/3x +1

elimination or substitution
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Volume of cylinder with a radius of 8cm and height of 25 cm

The water has been on the stove y=9.5x+62.1 after how many minutes will the tempature be 138.1 f

Which sum or difference identity would you use to verify that cos (180° - ∅) = -cos ∅? a. sin (α -β) = sin α cos β – cos α sin β b. cos (α -β) = cos α cos β – sin α sin β c. cos (α -β) = cos α cos β + sin α sin β d. sin (α + β) = sin α cos β + cos α sin β