EASY MATHS PLS HELP
2 answers:
Answer:
The value of x is 5/4 and y is -5.
Step-by-step explanation:
- Firstly, you have to make the 1st equation as (1)<em> </em>and make 2nd equation as (2).
- Secondly, you have to elimimate one of the variable. I choose to eliminate x in order to get rid of x, I add (1) and (2) together as -4x+4x = 0.
- Thirdly, you can solve the value of y. Then after getting y value, you can substitute y value into any equation. I choose to put y value into (1).
- Lastly, you can solve the equation to get x value.
- THE ANSWER IS OUT !!☝️☝️
Answer:
(1.25, - 5 )
Step-by-step explanation:
Given the 2 equations
- 4x + 3y = - 20 → (1)
4x + 2y = - 5 → (2)
Adding the 2 equations term by term will eliminate the x- term
5y = - 25 ( divide both sides by 5 )
y = - 5
Substitute y = - 5 into either of the 2 equations and solve for x
Substituting into (2)
4x + 2(- 5) = - 5, that is
4x - 10 = - 5 ( add 10 to both sides )
4x = 5 ( divide both sides by 4 )
x = = 1.25
Solution is (1.25, - 5 )
You might be interested in
Answer:
The probability that the average final exam grade of this sample is between 77 and 82
P(77≤ x⁻≤ 82 = 0.8315 or 83%
Step-by-step explanation:
<u><em>Step(i):</em></u>-
Given random sample size 'n' = 40
Mean of the normal distribution = 81
Standard deviation of normal distribution = 6.6
Let x₁⁻ = 77
Z₁ = -3.83
Let x₂⁻ = 77
Z₂ = 0.958
<em>The probability that the average final exam grade of this sample is between 77 and 82</em>
P(77≤ x≤ 82) = P( -3.83 ≤x≤0.958)
= A( 0.958) + A(3.83)
= 0.3315 + 0.4995
= 0.8315
<em>The probability that the average final exam grade of this sample is between 77 and 82 = 0.8315 or 83%</em>