-4x+y=6                                -5-y=21   (solving systems of equations by substitution

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To solve a system of equations by substitution, you solve one of the equations for either x or y, then substitute your solution for the x or y variable in the other equation.In this problem, I would suggest solving the second equation for 7, since there is no x variable in it.First add 5 to each side of the equation-5 - y = 21+5       +5-y = 26Then divide both sides by -1 to solve for y.y = -26Now substitute this y value into the first equation:-4x -26 = 6Solve for x. First add 26 to both sides.-4x - 26 = 6      +26     +26-4x = 32Then divide both sides by -4 to get x alone.x = -8So, your solution is x = -8 and y = -26, or (-8, -26)