Slope-intercept form or point-slope form. The last video, we could graph each of these.
One is x plus 2y is equal to 9,Īnd the other equation is 3x plus 5y is equal to 20. Try to figure out exactly where they intersect. To show you one algebraic technique for solving systems ofĮquations, where you don't have to graph the two lines and
Tenth step: You need common denominators to add fractions so change "9" to "27/3".Ī system of equations is. Seventh step: Divide both sides by (-3/2).Įighth step: Plug -11/3 in as "y" for the first equation. Sixth step: Subtract (5/2)y from both sides to isolate "y". Third step: In order to make the equation only have one variable, you substitute the second equation in for "x". Second step: You'd want to isolate the y in the first equation so you'd divide by 2 on both sides. Therefore, you can move the -9 in the first equation to the other side. This question isn't exactly the ideal question to use substitution but here:įirst step: You have the "x" variables isolated in both equations but you only need it to be isolated in one equation.
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