Q. Solve using substitution.y=9–7x+9y=11(_____, _____)
Substitute y=9: Substitute y=9 into the second equation.We are given y=9 and the equation –7x+9y=11. We will substitute 9 for y in the second equation.–7x+9(9)=11–7x+81=11
Isolate variable term x: Isolate the variable term x. Now we need to solve for x by isolating the variable on one side of the equation. –7x+81−81=11−81–7x=−70
Solve for x: Solve for x.Divide both sides of the equation by −7 to find the value of x.−7−7x=−7−70x=10
Write solution as ordered pair: Write the solution as an ordered pair.We have found x=10 and we were given y=9. The solution in the form of an ordered pair is (x,y).The solution is (10,9).
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