Question

Which of the graphs below represent the graphical solution to the following system of equations?

4x + 2y = 12
3x – y = 9

Answer 1

g1 - this is because if you take the simplest looking equation and solve for y, you get y= 3x-9. This means your y intercept is -9 and if you wanna be quick about it, you'd scan the graphs and only one meets this condition. If you wanna go further, take this equation and sub in 0 for y and solve for x and you will get 3. Meaning it crosses the x axis at 3 and that confirms your first graph picture :)

Answer 2

oh ok I get it ...thanks! :)