15x-20y= 7 5y-3 +10x
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x=-8
To solve the equation 10X = 2.7, you need to isolate the variable X. Start by dividing both sides of the equation by 10 to get X alone. This gives you X = 2.7/10, which simplifies to X = 0.27. Therefore, the solution to the equation 10X = 2.7 is X = 0.27.
Ok so your equation reads like this (I assume you forgot the +): 3 - 4x = 10x +10 The goal is to get the x's on one side and the other numbers on the other. It doesnt matter which side has which, so I will move the numbers to the right and the x's to the left. So first subtract 3 from both sides: 3 - 3 - 4x = 10x + 10 - 3 -4x = 10x + 7 Now subtract 10x from both sides. -4x - 10x = 10x - 10x + 7 -14x = 7 Now that we have like terms on both sides, all you need to do is divide both sides by -14 to solve for x. -14x / -14 = 7 / -14 x = -1 / 2
-10x = -50 Divide both sides by -10 remembering that a minus divided by a minus the quotient then becomes positive: x = 5 So: -10*5 = -50
12x + 9 = 10x + 1 Subtract 10x from both sides: 2x + 9 = 1 Sutract 9 from both sides: 2x = - 8 Divide both sides by 2: x = -4