Subtract the two equation from each other -3x-7y=-66 -10x-7y=-24 -------------------- 7x =-42 x=-6 by substituting in equation 1 (-3)(-6)-7y=-66 18-7y=-66 -7y=-84 y=12 so to check we substitute in the first equation
(-3*-6)-(7*12)=-66 18-84=-66 -66=-66 we check the second equations -10(-6)-7(12)=-24 60-84=-24 -24=-24
