Answer:
They will each have saved $70. 
Jessica is saving at a faster rate than Raphael. 
The rate at which Jessica is adding to her savings is $4 per week more than the rate at which Raphael is adding to his savings. 
Explanation:
The formula for Jessica’s savings is 
y = 10x + 20 
She is saving at the rate of $10/wk .
From Raphael’s table, he started with $40 and is saving at the rate of $6/wk. 
The formula for Raphael’s savings is 
y = 6x +40 
When the two savings are equal 
10x + 20 = 6x + 40 Subtract 20 from each side 
 10x = 6x + 20 Subtract 6x from each side 
 4x = 20 Divide each side by 4 
 x = 5 
Their savings will be equal after five weeks. 
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After five weeks , Jessica will have saved
y = 10×5 + 20 
y = 50 + 20 
y = $70 
Raphael has also saved $70. 
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Jessica is saving at a faster rate than Raphael. 
She is saving at the rate of $10/wk, while he is saving at the rate of $6/wk. 
The rate at which Jessica is adding to her savings is $4/wk more than the rate at which Raphael is adding to his savings. 
The red line in the graph shows that Jessica starts with $20. After five weeks, she has caught up to Raphael, who also has $70 after five weeks.