19. The slope-intercept form, for slope = m and intercept = b is
... y = mx + b
You are given m = 3/5 and b = 7, so you just need to put them into the formula.
... y = (3/5)x + 7
__________
37. When the variation is direct, the constant k in the equation
... y = kx
can be found as the ratio ...
... k = y/x . . . . . . . divide the above equation by x
You are given x=3 and y=-2, so you can find k from
... k = y/x = -2/3
and you can write the direct variation equation as
... y = (-2/3)x