Question

Consider the these two linear equations:

10x + 5y = 90
y = ax + 18
What value of a will make the two lines parallel?

Answer 1

a = -2

Explanation:

The first equation can be rewritten in slope-intercept form:

5y = -10x +90

y = -2x +18

The value a=-2 will make the second line identical to the first.