Four times a certain number is the same as the number increased by 78. Find the number.
Let x be the number. 4 times the number means 4 * x or 4x The number increased by 78 is x + 78. They are the same. Solve the equation: \(\Huge 4x = x + 78\)
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Okay, so here, you gotta subtract x from both sides. Then you isolate x.
so it would be 3x=78
You isolate a given variable by doing the opposite thing. Like if it's x + 78, then you gotta do the inverse operation i.e subtract 78 to isolate x.
Isolating means making the variable a subject on one side.