First add 9 to both sides of the equation, you end up with the answer x=10
Since there is no indicated variable, I am at a complete loss as to what the link at scribd.com will solve!
carefully
This answer applies to programming languages in general. The equals sign is used for assignment. For example, the code "$variable = 1" assigns the value of 1 to the variable $variable. If you want to test whether values are the same (equality) the double equals sign is used. For example, when you want to verify that $variable has been assigned the value of 1 you would use: $variable == 1
This is an instruction to increment the value of a variable by 1 (in this case, either the variable count or the variable total).
2sinx+1 equals 0
1
15+4m=-14m=-16 (subtract 15 from both sides to isolate variable (4m))m=-4 (divide each side to isolate variable from coefficient)
If x = 1 then X is not really a random variable but a constant.
the square root (abbreviated: sqrt) of x9 can be written like this: sqrt(x9) = (x9)(1/2) = x[9*(1/2)] = x(9/2)
You cannot solve one equation in two variables. You can express either one of the two variables (x or y) in terms of the other but, since you still have an unknown variable, nothing has been "solved".
The easiest way to solve this system of equations is to solve for a variable in one of the equations. In the second equation, y = 3x. This can be substituted into the first equation: y = -4x - 7; 3x = = -4x - 7; 7x = -7; x = -1. Since we have determined that x equals -1, we can then substitute -1 into either equation to find our corresponding y-value. Thus: y = 3x; y = 3(-1) y = -3. Thus, the solution to this system of equations is (-1, -3).
To solve the equation for either y or x, you need to have a value for the variable you are not trying to solve for. For example, if you're solving for x in y = -6x + 1, when y = 0: 0 = -6x + 1 (substitute 0 for y) 6x = 1 (add 6x to both sides) x = 1/6 (divide both sides by 6)