11 The equation of the line can be written in slope-intercept form as y = mx + b, where m is the slope and b is the y-intercept. Substituting m = 2 and b = -4, we get:
y = 2x - 4
To find the value of y when x = 6, we can substitute x = 6 into the equation and solve for y:
y = 2(6) - 4 = 8
Therefore, the value of y when x = 6 is 8.
12 The equation of the line can be written in slope-intercept form as y = mx + b, where m is the slope and b is the y-intercept. We are given that the slope is -- (which is equivalent to 1/2), and the y-intercept is (0,3). Therefore, the equation of the line is:
y = (1/2)x + 3
To find the value of y when x = 4, we can substitute x = 4 into the equation and solve for y:
y = (1/2)(4) + 3 = 5
Therefore, the value of y when x = 4 is 5.