1)7x+8y=4
2)3x+2y=6
they asked you for the pair which is (x,y)
multiplying equation 2 by 4 we get
3)12x+8y=24
subtracting equation 1 from 2
7x+ 8y=4
(-) 12x+8y=24
-------------------------
-5x =-20
dividng by -5 we get
x = 4
substituting the value of x in either of the 2 equations we get
7x+8y=4-->7(4)+8y=4-->8y=-24--->y=-3
3x+2y=6-->3(4)+2y=6-->12+2y=6-->2y=-6-->y=-3
since we got the same values for y in the two equation are soultion is correct
the pair is in form (x,y)--->(4,-3) which is D
