a plane can travel 1,015 miles in 7 hours traveling against the wind. traveling

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with the same wind,the plane c? a plane can travel 1,015 miles in 7 hours traveling against the wind. traveling with the same wind,the plane can travel 820 miles in 4 hours. how fast can the plane travel in still air and how fast is the wind current?

please show how you got the answer and its something about substitution and 8th grade math and its OK if it has an decimal or fraction.
 
Let x = speed of plane
and y = speed of wind

=> (x - y) * 7 = 1015
=> x - y = 145 ... (1)

and
=> (x +y) * 4 = 820
=>x + y = 205 ... (2)

Adding equations (1) and (2),
2x = 350
=> x = 175 mph
and y = 205 - 175 = 30 mph

Answer:
Speed of plane = 175 mph
Speed of wind = 30 mph.
 
Let x = speed of plane
and y = speed of wind

=> (x - y) * 7 = 1015
=> x - y = 145 ... (1)

and
=> (x +y) * 4 = 820
=>x + y = 205 ... (2)

Adding equations (1) and (2),
2x = 350
=> x = 175 mph
and y = 205 - 175 = 30 mph

Answer:
Speed of plane = 175 mph
Speed of wind = 30 mph.
 
Let x = speed of plane
and y = speed of wind

=> (x - y) * 7 = 1015
=> x - y = 145 ... (1)

and
=> (x +y) * 4 = 820
=>x + y = 205 ... (2)

Adding equations (1) and (2),
2x = 350
=> x = 175 mph
and y = 205 - 175 = 30 mph

Answer:
Speed of plane = 175 mph
Speed of wind = 30 mph.
 
Let x = speed of plane
and y = speed of wind

=> (x - y) * 7 = 1015
=> x - y = 145 ... (1)

and
=> (x +y) * 4 = 820
=>x + y = 205 ... (2)

Adding equations (1) and (2),
2x = 350
=> x = 175 mph
and y = 205 - 175 = 30 mph

Answer:
Speed of plane = 175 mph
Speed of wind = 30 mph.
 
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