With difficulty because it's not an equation but an expression.
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It is an equation and the value of x is 4
2x+y = 10 x +y = 4 Subtract bottom equation from top equation: x = 6 Substitute the value of x into the equations to find the value of y: x = 6 and y = -2
It is an equation and the value of v is 5.16
It is an equation and the value of c is -7
You can tell if an equation is a function if for any x value that you put into the function, you get only one y value. The equation you asked about is the equation of a line. It is a function.