A linear equation simply means there are no squared's or cubed's or any other nasty bits in it. It could look like this:
15x + 19 = 49
To solve this, you subtract 19 from both sides to give:
15x = 30
Then divide both sides by 15 so you find x = 2
You can sometimes find an equation with two variables in it such as 4x + 5y = 100. However you cant find two variables form one equation, you need two and this is called simultaneous equations.
On the secondary problem, such as 4x + 5y = 100, you can use the substitution method.
It involves setting the x to zero and solving, and then setting y to zero and solving.
Let's solve for "y":
Therefore the ordered pair is (0, 20)
Let's solve for "x":
Therefore the ordered pair is: (25, 0)
Chat with our AI personalities
If it is a linear function, it is quite easy to solve the equation explicitly, using standard methods of equation-solving. For example, if you have "y" as a function of "x", you would have to solve the variable for "x".
1
z=.3
At the x-intercept on the graph of the equation, y=0. Take the equation, set 'y' equal to zero, and solve the equation for 'x'. The number you get is the x-intercept.
You cannot solve 1 linear equation in 2 unknown variables. You need at least two independent equations.