Elimination system 8x

-6y=-20 and - 16x+7y=30

At the first you have to subtract or add (according to their sign) the both equation and mutiply the first equation by 2 for making the (8x equal to 16x) and then subtract then and finf the y value. When you find the y value write it instead of "y" on one of equations and find the x value ...