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Paladinen [302]
2 years ago
7

The graph of a line in the xy-plane has slope 2 and contains the point (1,8). The graph of a second line passes through the poin

ts (1,2) and (2,1). If the two lines intersect at the point (a,b), what is the value of a+b?
SAT
1 answer:
Radda [10]2 years ago
6 0

Answer:

3

Explanation:

f(x)=2x+c

contain the point(1,8)

2+c=8

c=6

g(x)=kx+d     contains (1,2)(2,1)

k+d=2 and 2k+d=1

k=-1  

d=3

g(x)=-x+3

f(x)=g(x)

2x+6=-x+3

x=-1   so f(x)=g(x)=2*-1+6=4

a+b=4-1=3

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