Resuelve los siguientes sistemas de ecuaciones con dos incógnitas X + Y = 10
6X – 7Y = 34

7X + 8Y = 264
X – Y = 27

3X - Y = 1
2X + 3Y = 8

2X + 5Y = 12
2X + 3Y = 8

2X + 7Y = 22
2X + 3Y = 14

-X + 34Y = 0
2X + 34Y = 9

3X - 5Y = 25
5X + 5Y = 15

7X - 4Y = 3
2X + 4Y = 42

2X + 3Y = 37
5Y + 3X = 58

3X - 2Y = 18
7X - 5Y = 41

Data from 2005 for various age groups show that for each $100 increase in the median weekly income for whites, the median weekly income of blacks increases by $105. also, for workers of ages 25 to 54 the median weekly income for whites was $676 and for blacks was $527. (a) let w represent the median weekly income for whites and b the median weekly income for blacks, and write the equation of the line that gives b as a linear function of w. b = (b) when the median weekly income for whites is $760, what does the equation in (a) predict for the median weekly income for blacks?