Answer:
y=90 when x=4
Step-by-step explanation:
We are given that

When x=8 and y=250
We have to find the value of y when x=4

Where k= Proportionality constant
Substitute the values




Now, substitute x=4 and k=5/2
Then, we get



Answer:
y = 2x + 4
Step-by-step explanation:
The equation of a line in slope- intercept form is
y = mx + c ( m is the slope and c the y- intercept )
Here m = 2 , then
y = 2x + c ← is the partial equation
To find c substitute (- 2, 0 ) into the partial equation
0 = - 4 + c ⇒ c = 0 + 4 = 4
y = 2x + 4 ← equation of line
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