y = 100 - 4x ( a ) Find the value of y when x = 20.
y = 5x + 3When x=2,y = 5(2) + 3 = 10 + 3 = 13
-6
It is the intercept: the value that y takes when x = 0
x = 9/2 or x = -2 Solved by using the quadratic equation formula.
y and ½z
y = 6
y = 100
Any value
y = 10. easy!
15
13 ? 15
y/90
18
Y = 2
y = -26
3