Question #15:
Slope-intercept form: y = mx + b
(m is the slope, b is the y-intercept or the y value when x = 0 --> (0, y) or the point where the line crosses through the y-axis)
You know:
m = 4
b = -3 So substitute/plug it into the equation
y = mx + b
y = (4)x + (-3)
y = 4x - 3 Your answer is C
Question #16:
Point-slope form: y - y₁ = m(x - x₁)
(m is the slope, (x₁ , y₁) is the point you are given)
You know:
m = 2
(x₁ , y₁) = (3, 1) So substitute/plug it into the equation
y - y₁ = m(x - x₁)
y - (1) = 2(x - (3))
y - 1 = 2(x - 3) Your answer is F
Questions #17:
Yoga lessons cost $5 per lesson if Kylie enrolls in the health club for a fee of $120 per year. Which equation represents the yearly cost C of l yoga lessons?
C = the total cost of a year
l = the number of yoga lessons
C = 5l + 120
(the total cost of a year = $5 per lesson(l) plus a fee of $120 per year, so you pay a fee of $120 once a year)
Your answer is B