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Sagot :
1: x + y = 31
2: y - x = 9
1 rearranged for x: x = 31-y
2 rearranged for x: x = y-9
31-y = y-9
40 - y = y
40 = 2y
y = 20
Plug y in any equation to solve for x
x + 20 = 31
x = 11
20 is greater than 11
Your answer is D
2: y - x = 9
1 rearranged for x: x = 31-y
2 rearranged for x: x = y-9
31-y = y-9
40 - y = y
40 = 2y
y = 20
Plug y in any equation to solve for x
x + 20 = 31
x = 11
20 is greater than 11
Your answer is D
Answer:
20
Step-by-step explanation:
let one number be X and the other Y
so that
X+Y=31
X-Y=9
by use of simultaneous.... X= 20 and Y is 11
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