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what is variable linear equation I need a example

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Variable linear equation: y=ax+b, where a and b are any number , you can also called constant

                              and y and x are variable for example y= 2x+9, called linear equation.

can't be linear

x^2 (no exponents on variables)
2xy + 4 (can't multiply two variables)
2x / 4y (can't divide two variables)
√x(no square root sign on variables)




Inequalities are the relations involving linear expressons. Equation is a special case of relation of inequality only.

for example

2x<3  such and expretion which doen't involve (=) sigh.