Below is the measurement division mode for 6 divided by 4/7 equal 7 1/2. note that 4/5 goes into 6 seven times with 2 fractional units left over (circled). those two fractional units give the 1/2 in 7 1.2 because they represent (choose one)

a. 1/2 of the dividend (i. e., 1/2 of 6)

b. 1/2 of whole unit (i. e., 1/2 of 1)

c. `1/2 of 4 fractional units (i. e., 1/2 of 4/5)

Ok here we go ..there are plenty of ways to solve such math problems but we will go for the smartest and easiest ..5x+2y=7  -2x+6y=9we rearrange them into the following ..by multiplying the 1st equation by 2 it becomes 10x + 4y = 14we rearrange it and so it becomes 10x = 14 - 4yas for the second equation we multiply it by 5 and rearrange it so it becomes as to the following ..-10x + 30y = 45rearranging so 10x = 30y -45now 10x equals both 14 - 4y and 30y -45so   14 - 4y = 30y -4531 = 26yy= 31/26 = 1.19 or around 1.2so by now we can calculate x easily as  -2x+6y=9so 2x = 6y -9 = 6 * 31/26 - 9 = -1.84  then x = - 0.92 or around -0.9best luck!