ANSWERS: 5

2y = 5x + 15; 20x = 4y10 20x + 10 = 4y 5x + 5/2 = y ; substitute 2(5x + 5/2) = 5x + 15 10x + 5 = 5x + 15 5x = 10 x = 2 Now substitute back 5(2) + 5/2 = y 10 + 5/2 = y 12 1/2 = y

First you need to isolate the variable. Move the 5 to the right hand side of the equation and it becomes a +5. From there you get 20=2y. Then simply divide by 2 to solve for y.

2y = 15+5 2y = 20 y = 10

dude. 15 = 2y  5? damn. transpose 5 to the opposite side to make it positive. 15 + 5 = 2y 20 = 2y then divide both sides by two to let alone the variable y. 20/2 = 2y/2 10 = y

Come on guys! Don't do his homework for him! It's a good idea, though. Come on kid. it's not that hard.
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