Answer:
Step-by-step explanation:
Question 1
System of equations is,
y = -6x -------(1)
y = -4x - 2 ---------(2)
Substitute the value of y from equation (1) to equation (2)
-6x = -4x - 2
-6x + 4x = -2
-2x = -2
x = 1
From equation (1)
y = -6(1)
y = -6
Question (2)
System of equations is,
-y = x --------(1)
3x + 5y = 20 ---------(2)
Substitute the value of x from equation (1) to equation (2)
3(-y) + 5y = 20
-3y + 5y = 20
2y = 20
y = 10
From equation (1)
-y = x
x = -10
Question (3)
System of the equations is,
y = -2x - 7 --------(1)
9x - 10y = 12 ----------(2)
Substitute the value of y from equation (1) to equation (2)
9x - 10(-2x - 7) = 12
9x + 20x + 70 = 12
29x = 12 - 70
29x = -58
x = -2
From equation (1)
y = -2(-2) - 7
y = 4 - 7
y = -3
Answer:
y =
Step-by-step explanation:
In equations, it's important to complete an operation to both sides because if it is only completed on one then the whole equation will change and the solution will be different so it's an important rule to remember when solving equations that you have to keep the equation balanced.
→ 6 = 4x + 9y
⇒ Minus 4x from both sides to isolate 9y
→ 6 - 4x = 9y
⇒ Make 'y' the subject
→ 9y = 6 - 4x
⇒ Divide both sides by 9 to isolate 'y'
→ y =
Answer:
120%
Step-by-step explanation:
The ratio you are solving is 48/40
Divide the numerator by the denominator just like you would do with any other fraction.
48÷40=1.2
Your answer is 120%
There’s not enough info to answer this
Answer:
The $52 jacket by 60(0.60) cents.
Step-by-step explanation:
To find how much percent off is each item. We would need to multiply 52 by 0.85 and 56 by 0.80. The work is below:
52*0.85=44.2
56*0.80=44.8
We can say that the $52 jacket costs less than the $56 jacket by a difference of 60(0.60) cents.
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