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What does it mean to substitute a given value for each variable in an algeraic expression?
It means you replace each instance of the given variable with the given value. For instance, you have the following equation: A(A+2A)= B Then someone says to "substitute the value '4' for each instance of 'A'. You'd just replace them, and get: 4 ( 4 + 2(4)) = B
How do you solve a equation y7.80x plus 40?
Assuming you mean y = 7.80x + 40: This has infinitely many solutions, and it is already solved for "y". If you substitute ANY value for "x", you can calculate the corresponding value for "y".
How did you find each product of quadratic equations?
You substitute the value of the variable into the quadratic equation and evaluate the expression.
What is substitution of 4x-3y equals 1 x-2y equals 4?
To solve this system of equations using substitution, we can isolate one variable in one equation and substitute it into the other equation. From the second equation, we can express x in terms of y as x = 4 + 2y. Then, substitute this expression for x into the first equation: 4(4 + 2y) - 3y = 1. Simplify this equation to solve for y. Once you find the value of y, substitute it back into x = 4 + 2y to find the corresponding value of x.
How do you know if an order pair is on the line of an equation?
Substitute the first of the ordered pair wherever x appears in the equation and the second value wherever you have y. Evaluate the equation. If it is true, then the point is on the line and if not, it is not.
