Chapter 7 - Exponents and Exponential Functions - Cumulative Test Prep - Multiple Choice - Page 469: 8

G) -2

$(2,0)$ and $(0,-1)$ are on the line $m=(0--1)/(2-0)$ $m=1/2$ $y=mx+b$ $0=1/2*2+b$ $0 = 1 + b$ $-1 = b$ $y=1/2*x-1$ The current y-intercept is at -1 $(0,-1)$. Since we are increasing it by 2 units, the new intercept is at 1 $(0, 1)$. The formula also changes to $y=1/2*x+1$ $y=1/2*x+1$ Let $y=0$ $y=1/2*x+1$ $0=1/2*x+1$ $-1 = 1/2*x$ $-1*2 = 1/2*2*x$ $-2 = x$