单选题If 2x-3y = 11 and 3x+15 = 0, what is the value of y?A-7B-5C1/3D3E10
单选题
If 2x-3y = 11 and 3x+15 = 0, what is the value of y?
A
-7
B
-5
C
1/3
D
3
E
10
参考解析
解析：
First solve the equation that contains one variable. Since 3x+15 = 0, then 3x = -15, so x = -15/3 = -5. Substituting -5 for x in the other equation, 2x-3y = 11, gives 2(-5)-3y = 11 or -10-3y = 11. Adding 10 to both sides of the equation makes -3y = 21, so y = -21/3 = -7.
First solve the equation that contains one variable. Since 3x+15 = 0, then 3x = -15, so x = -15/3 = -5. Substituting -5 for x in the other equation, 2x-3y = 11, gives 2(-5)-3y = 11 or -10-3y = 11. Adding 10 to both sides of the equation makes -3y = 21, so y = -21/3 = -7.
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