If x = -7, then 2nd equation is -7x + 3y = 64 : did you make a typo?SILVER said:how do you solve this?
My math book says there's an easier way to solve it than by adding the top by 3 and the bottom by 4 but I cant figure it out. when i tried to solve I got x=350 but the answer is x=-7 please help!
I think the point your book is trying to make is that you don't NEED to eliminate the y terms first (which is what would happen if you multiply the top equation by 3 and the bottom by -4). As Denis has shown you, simply adding the two equations AS THEY APPEAR is much quicker. Since 7x + (-7x) is 0, you'll be left with an equation that has just one variable....which is what you want. It does not matter WHICH variable you eliminate first.SILVER said:oops im sorry it was a typo. The real question was:
and my book says there's an easier way to solve it than multiplying the top by 3 and the bottom by -4