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Mathematics 7 Online
OpenStudy (anonymous):

Here are Janet's steps for solving the system below by eliminating x. 2x + 3y = -1 5x + 8y = 0 Step One: Multiply the first equation by 5. 10x + 15y = -5 Step Two: Multiply the second equation by -2. -10x - 16y = 0 Step Three: Add the two equations. y = -5 Step Four: Substitute y back into the first equation. 2x + 3(-5) = -1 Step Five: Solve for x. 2x - 15 = -1 2x = 14 x = 7 Is she correct? Justify your answer. If incorrect, describe the error.

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