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Hi there! Have questions about your homework? At Brainly, there are 60 million students who want to help each other learn. Questions are usually answered in less than 10 minutes. Try it for yourself by posting a question! :D

1) x - y =10 ----- (1) x + y =10 ------ (2) from (1) x = 10 +y putting this in (2) (10+ y) + y = 10 i.e 2y = 0 so y = 0 from (2) y = 10 - x put this in (1) x -(10- x) =10 so 2x = 20 i.e x = 10 hence x= 10 y = 0

2)2x + y = 7 ---------> y = -2x + 7 substitute y = -2x + 7 in 3x - 2y = 0 3x - 2(-2x + 7) = 0 3x + 4x -14 = 0 7x = 14 divide each side by 7 x = 2 substitute x = 2 in y = -2x + 7 y = -2 * 2 + 7 = -4 + 7 = 3 (x, y )= (2, 3)