find the linear equation in two variables passing through two points (1,1) and (-1,5)
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First find the slope.
m= x^2 -x^1 / y^2 - y^1
m = -1 -1 / 5 -1 = -1/2
So y= -1/2x + b
Now plugin the x and y variables: 1= -1/2 * 1 + b
Thus b = -1/2
Therefore: y= 1/2x - 1/2
m= x^2 -x^1 / y^2 - y^1
m = -1 -1 / 5 -1 = -1/2
So y= -1/2x + b
Now plugin the x and y variables: 1= -1/2 * 1 + b
Thus b = -1/2
Therefore: y= 1/2x - 1/2
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