x=3, y=7 since this is a simultaneous equation, i assume you want to find the values of x and y. y – x = 4 x+y = 10 you can put y on its own, on both sides: x+y = 10 y = 10-x y – x = 4 y = x+4 y = 10-x, y = x+4 -> 10-x=x+4 subtract 10: -x= x-6 add x: 2x – 6 = 0 add 6: 2x = 6 divide by 2: x = 3 then, put 3 as x in the second equation: x+y = 10 3 + y =10 subtract 3: y = 7 x=3, y=7
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