Question 776115

How do you solve by using elimination with 2x-4y=28  4x=17-5y


2x - 4y = 28 ----- eq (i)


4x + 5y = 17 ----- eq (ii)


It's easiest to multiply eq (i) by - 2, or 2 and then add, or subtract both equations to ELIMINATE the x-variable, and determine the y-value. Then substitute the y-value into any of the 2 equations and determine the value of x.


You could also multiply eq (i) by 5 and eq (ii) by 4 to ELIMINATE the y-variable, but this would entail a little bit more work.