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PtichkaEL [24]
3 years ago
8

Solve using the substitution method -7x+y =42 and 5x+13y =66

Mathematics
1 answer:
leva [86]3 years ago
5 0
-7x+y=42
y=42+7x 

5x+13y=66
Substitute for y (meaning put 42+7x into the equation above instead of y because they are equal - see second line of my answer above)

5x+13[42+7x]  = 66
5x +546 = 66
5x=66-546
5x=-480
x=-480/5
x=-96

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7 0
2 years ago
A gear in a machine turns 2 1/2 times every hour.
givi [52]
We can solve this by multiplying those two numbers but we place them in improper fraction.

2 1/2 x 2 1/4
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for fraction multiplication, just multiply numerator by numerator and denominator by denominator

5/2 x 9/4 = 45/8

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6 0
3 years ago
If θ = 330° and α = 300°, find the exact value of tan θ − sin α.
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X = tan (330) - sin (330)
x = 0.133557089 - -0.132381629
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7 0
3 years ago
Natalie Albert deposited checks totaling $1,735,97 into her savings account. She withdrew $100.00 while
givi [52]
Anything withdrawn you subtract. Then, you know the total and you know what you had. Subtract total from what you had and you will see the change.

1735.97-100=1635.97

1668.71-1635.97=32.74



7 0
2 years ago
Use these similar triangles on the coordinate plane to determine the equation of a straight line with a slope of 5/3 that passes
Zina [86]

Answer:

y=5/3x

Step-by-step explanation:

5 0
2 years ago
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