5y = 10x+11 −5y = 5x−21 The solution to the given system of equations is x,y. What is the value of 30x?
Correct answer: 20
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Explanation
20 The correct answer is . Adding the first equation to the second equation in the 5 -5 =10 +51+1 -21 0=15 -10 10 given system yields y y x x , or x . Adding to 10=15 both sides of this equation yields x. Multiplying both sides of this equation 20=30 30 20 by 2 yields x. Therefore, the value of x is .
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