Solving Equations Using Tables Please view this tutorial and answer the follow-up questions on loose leaf to turn in to your teacher.

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Presentation transcript:

Solving Equations Using Tables Please view this tutorial and answer the follow-up questions on loose leaf to turn in to your teacher.

When given an equation to solve for x… 1)Plug the side of the equation containing x into y= on the calculator Ex) Solve -15x + 10 = -35 for x. **Type -15x+10 into y=

When given an equation to solve for x… 2)Since you are replacing -35 for the ‘y’ variable you need to search for -35 in the ‘y’ column in your table Ex) Solve -15x + 10 = -35 for x. ** Find -35 in the ‘y’ column in your table.

When given an equation to solve for x… 3) The value in the ‘x’ column is your answer to the problem. Ex) Solve -15x + 10 = -35 for x. ** x = 3 is the correct answer to the problem.

When given an equation to solve for x… 4)To check your answer, substitute your answer back in for x. After you compute the left side of the equation it should equal the right side. Ex) Check to see if x = 3 is the correct answer for -15x + 10 = (3) + 10 = x + 10 = = = -35

When given an equation with an x 2 term… Because of the parabola shape that a y = x 2 graph makes, there are usually two answers for x that make the equation true. Ex) Solve x 2 + 3x - 9 = 9 for x. ** Find 9 in the ‘y’ column twice.

When given an equation with an x 2 term… Ex) Solve x 2 + 3x - 9 = 9 for x. ** Find 9 in the ‘y’- column twice. X = 3 is one answer. and X = -6 is the other answer.

When given an equation to solve for y… Since y is already by itself in the equation, you should just compute the other side of the equation. Ex) 3(-4) – 10 = y for y. ** Compute the left side of the equation to figure out what ‘y’ equals 3(-4) – 10 = y -12 – 10 = y -22 = y So, y = -22.

Follow-Up Questions Answer the following questions on loose leaf and hand them in to your teacher.

Follow-Up Questions Solve the following equations for the missing variable: 1) x + 9 = 18 2) 3x – 18 = -30 3) -5x + 6 = -19 4) Y = 3(2) ) x 2 – x + 2 = 8