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In math problems without punctuation such as brackets, the standard convention in to solve from left to right. Therefore, you would solve the problem 15-3 times 4 plus nine like by three actions. 15-3 equals 12; 12 times 4 equals 48; 48 plus 9 equals 57.
All you need to do is add the numbers together like you would for two plus two. To check your work, a calculator will be a great option,but before you use one:for more of a challenge USE YOUR BRAIN! The answer is 288.
If X+Y = 42, and 2X + Y = 57, then if you subtract the first equation from the second, 2X + 1Y = 57 1X + 1Y = 42 - ---------------- 1X + 0Y = 15 That means that Y = 27. 15 + 27 = 42 15 + 15 + 27 = 57.
9 - 4x = 57 9 - 9 - 4x = 57 - 9 -4x = 48 -4x/-4 = 48/-4 x = -12 Always double check your answer. 9 - 4x = 57 9 - 4(-12) = 57 9 + 48 = 57 57 = 57 So 9 - 4x = 57 when x = -12
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