Answer:
No mistake
Step-by-step explanation:
2x + y = 5
x - 2y = 10
y = 5 - 2x
x - 2(5 - 2x) = 10
x - 10 + 4x = 10
5x - 10 = 10
5x = 20
x = 4
2(4) + y = 5
y = -3
She made no mistake
You can check by plugging in x = 4 and y = -3 into the original equations . They fit exactly.
Answer:
She has 7 $5 dollar bills and 4 $1 dollar bills.
Step-by-step explanation:
& times 5 plus 4.
Volume of cylinder = πr^2 × h
= π × (5/2)^2 × 13
= 255.25 yd^3
Answer:
-4y-7
Step-by-step explanation:
-4y-4-3
-4y-7
300, because 8x20=160 so 1 ounces= 20 calories
15x20=300
