Question

8x - 4 = 2x + 20 by trial and error method plz help quick .​

Answer 1

Answer:

Simple Equations

Simple equations are the general way of representing a relationship between a set of variables or the unknowns. Why are they called equations? An equation is an equality of expressions. It involves the equality (=) sign. Simple equations are the conditions on the variables. An equation tells that the expression on the left side is equal to that on the right side. The expression on the left side of ‘=’ is the LHS and the one on the right side is the RHS.

Terminologies of Simple Equations

Let us make ourselves familiar with some of the terms. A simple equation has two parts – Variables and Constants.

Variables: As the name suggests variables means ‘vary or changeable’. Variables denote the unknown values. They are represented by English letters like a, b, c, x, y, z etc. They can take any value.

Constants: Constants have the fixed numerical value like 1, 2, 5, 10, 87 etc. These are unchangeable.

Root or Solution: The value of the variable for which LHS = RHS is the root or the solution of a simple equation.

Terms: The parts of a simple equation joined by + or − sign are terms.

Answer 2

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$8x - 4 = 2x + 20$

$8x - 2x = 20 + 4$

$6x = 24$

$x = 4$

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