What is the solution to X and Y in these equations 3x + 9y=60 and - 3x + y=30

x = - 7 and y = 9

Step-by-step explanation:

multiply equation 1 by 1 which is the coefficient of y in the 2nd equa and equation 2 by 9 which is the coefficient of the first equation that will give:

3x + 9 = 60

-27x + 9y = 270

then add the two together that will give:

-27x - 3x + 9y - 9y = 270 - 60

-30x=210

x = - 7

substitute x for - 7 in equation 1

3 (-7) + 9y=60

-21+9y = 60

9y=60+21

9y=81

divide both sides by 9

that will give the answer 9

so x = - 7 and y = 9