1. The problem asks us to construct an equation in slope-intercept form $y=mx+b$ to represent the total hours $e$ a customer uses their phone per day, based on the number of calls $t$ made per day. 2. We know from the problem that each call accounts for 0.25 hours per day, and texting accounts for 1.75 hours per day regardless of calls. 3. The slope $m$ represents the hours per call, so $m=0.25$. 4. The intercept $b$ represents the constant hours spent texting, so $b=1.75$. 5. Therefore, the equation is: $$e = 0.25t + 1.75$$ This means the total hours $e$ a customer uses their phone per day equals 0.25 times the number of calls $t$ plus 1.75 hours for texting.