5x + 60y = 35
x +y = 1.5 : rewrite as x = 1.5-y and substitute this formula for x in the first one:
5(1.5-y) + 60y = 35
distribute:
7.5 - 5y + 60y = 35
combine like terms:
7.5 + 55y = 35
subtract 7.5 from both sides:
55y = 27.5
divide both sides by 55 to solve for y
y = 27.5 / 55 = 0.5
now substiute 0.5 for y in the 2nd equation:
x + 0.5 = 1.5
x = 1.5 - 0.5 = 1
he walked for 1 hour
Answer:
21y
Step-by-step explanation:
= 3(2y+5y)
= 3 × 7y
= 21y
That's it
Have a good day
Answer:
four days: 320 pence
seven days: 560 pence
Step-by-step explanation:
Multiply the cost by the number of days.
80 pence× 4 days= 320 pence
80×4=320
80×7=560
8 students out of 27
the total of students is 27 out of the 27 students 19 dont play and instrument and a sport
Answer:
The perimeter of the polygon is 48 cm.
Step-by-step explanation:
Given: 
To find the perimeter of the polygon, we need to find the lengths of the AB, BC, CD and DA
Since, and to find the length, from circle theorem, "Two tangents from an external point to a circle are always equal in length".
From this statement we shall conclude,
The length of 
The length of 
The length of 
The length of 
Thus, the perimeter of the polygon is
Hence, the perimeter of the polygon is 48 cm.
