X + 9y = -1 and 2x + 4y = 5 How would I solve by substitution?

If you subtract 9y from the left side of the equation and move it to the right side of the equation, it will change the equation to x = -9y - 1. plug in this equation for x in the other equation (making it 2(-9y - 1) + 4y = 5. Distribute the 2 into the parentheses (making the equation turn into -18y - 2 + 4y = 5). Solve the equation from there, adding alike terms (-18y + 4y = -14y) then adding two to both sides (-14y - 2 = 5, turning into -14y = 7). Then divide both sides by -14, making y = -0.5. then plug in y (-0.5) into the old equation (x = -9(-0.5) -1). distribute -9 into -0.5, making the equation x = 4.5 - 1. solve the equation, making x = 3.5 and y = -0.5. the ordered pair would be (3.5,-0.5).

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Equatorial triangle and obtuce angle