alisonlebron15
20.10.2019 •
Mathematics
7.
two equations are given below:
a – 3b = 4
a = b – 2
what is the solution to the set of equations in the form (a, b)? (5 points)
(–2, –2)
(–3, –1)
(–9, –7)
(–5, –3)
8.
a student is trying to solve the set of two equations given below:
equation a: x + z = 6
equation b: 2x + 4z = 1
which of the following is a possible step used in eliminating the z-term? (5 points)
multiply equation b by 4.
multiply equation a by 2.
multiply equation a by –4.
multiply equation b by 2.
9.
the work of a student to solve a set of equations is shown:
equation a: y = 4 – 2z
equation b: 4y = 2 – 4z
step 1: –4(y) = –4(4 – 2z) [equation a is multiplied by –4.]
4y = 2 – 4z [equation b]
step 2: –4y = 4 – 2z [equation a in step 1 is simplified.]
4y = 2 – 4z [equation b]
step 3: 0 = 6 – 6z [equations in step 2 are added.]
step 4: 6z = 6
step 5: z = 1
in which step did the student first make an error? (5 points)
step 1
step 3
step 4
step 2
10.
variable p is 2 more than variable d. variable p is also 1 less than variable d. which pair of equations best models the relationship between p and d? (5 points)
p = d + 2
p = d – 1
p = d – 2
p = d + 1
d = 2p
d = 2p – 1
d = 2p
d = 2p + 1
Solved
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Ответ:
-2b = 6
b = -3
a = -5
solution is (-5,-3) <==
8. multiply A by -4...this eliminates the z's when added <==
9. first error...step 2he didn't distribute correctly <==
10. p = d + 2 : p = d - 1 <==
Ответ:
7.The solution to the set of equation in the form (-5,-3).
8.Multiply equation A by -4 used to eliminate the z- term.
9.Step 2: { equation A in step1 is simplified}.
10.
.
Step-by-step explanation:
7. Two equation are given below:
II eqaution can be write as
Subtracting equation II from equation I then we get
By division property of equality
By simplification we get
Substitute the value of b in equation I then we get
Hence, the solution of the set of equation is (-5,-3).
8. Equation A:
Equation B:
Equation A is multiplied by -4 then we get
Equation A:
Adding both equation A and B then we get
Multiply equation A by -4 to eliminate the z-term.
9.Equation A:
Equation B:
Step1 :
Equation A is multiplied by -4
[equation B]
Step 2:
[equation B]
Equation A in step1 s simplified .
Step3:
Equations in step 2 are added.
Step 4:
Step5:
Hence, in step 2 student did make first an error.
10. Given
Variable p is more than variable d
We can write in algebraic expression
Variable p is also 1 less than variable d.
Then the algebraic expression
Hence,
Ответ:
Maybe b but not sure
Step-by-step explanation: