If: 3x = 15
Then: x = 5
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If: 3x = 45 Then: x = 15
6x - 12 = 3x + 15 3x = 27 x = 9
If you mean: x^2+15-3x then its value is 19 when x equals 4
3x = 15 >> 3x = multiplication, and the opposite of multiplication is division. So you take 3x, draw a line under it to show division, then write 3. After that, cross out the 3x/3. With algebra what you do to one side, you do to the other, so then you take 3 and divide it by 15. >>the answer>> X=5
Get in slope intercept form. 3X + 5Y = 15 5Y = -3X + 15 Y = -3/5X + 3 -3/5 is the slope of this line and the line parallel to this line