Today in math class we checked the test we did yesterday and I am going to show how to solve 2 of the given problems.
The fist thing to do is to move the variable to the left sides.
I subtracted both sides of the equation by -3m to cancel the variable on the right side.Remember that what you did to the right side, you must do it to the left side and vice-versa.
We have to get rid of multiplication, so we have to divide both sides of the equation by the numerical coefficient 6. Again remember that what you did to the left side, you must do it to the right side.
To check if your answer is correct:
1. copy the given equation
9m = 3m - 48
2. substitute the answer (-8) to m
9(-8) = 3 (-8) -48
The next one I am going to solve is a word problem.
5. You bought a pen for $5 and 4 erasers. You spent a total $25. How much did each eraser cost?
First we have to represent the cost of each eraser by n
Let n = cost of each eraser
4n + 5 = 25 translate words into equations
4n + 5 = 25 simplify the equation by subtracting both sides of the
-5 = -5 equation by 5
_______________4n/4 = 20/4 divide both sides of the equation by 4
n = 5 ~~~~~ the cost of each eraser
to check the answer, write the equation
4n + 5 =25
substitute n by the answer which is 5
4(5) + 5 = 25
20 + 5 = 25
25 = 25For the next scribe I pick CHRISTIAN...