If a+b=5 and a-b=3 then b=? a) -2 b) 1 c) 2 d) 4 e) 8 i think the answer is 1?

a+b=5 and a-b=3 should be re-written as

a+b=5

a-b=3

Combine these to obtain 2a = 8. Then a =4. Sub 4 for a in either equation. If you do that in the 2nd equation you'll get 4 - b = 3, or b = 1.

Then the solution is (4,1). Please note that this has 2 parts: 4 and 1.

These are the coordinates of the solution, the point at which the 2 lines intersect.

use substitution to solve each system of equations. y = x + 5 3x + y = 25 62/87,21 y = x + 5 3x + y = 25 substitute x + 5 for y in the second equation. substitute the solution for x into either equation to find y. the solution is (5, 10)

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