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blsea [12.9K]
3 years ago
14

Hi! Can anybody help me with these problems? I have to do 2 step equations.

Mathematics
2 answers:
Dovator [93]3 years ago
6 0
1) 3.8x + 5.2x - 6.7 = 11.3
9x = 11.3 + 6.7
9x = 18
x = 18/9
x = 2

2) 7.8y - 4.9 - 5.4y = 2.3
2.4y = 7.2
y = 7.2/2.4
y = 3

3)

\frac{2}{3} x - 5 = 1
\frac{2}{3} x = 5 + 1
\frac{2}{3} x = 6

Multiply by 3 by both sides:

3 \times \frac{2}{3} x = 3 \times 6

Simplify:

2x = 18
x = 18/2
x = 9

4)

\frac{7}{5} y = 3 - \frac{1}{5}

Do lowest common denominator:

\frac{7}{5} y = \frac{(5 \times 3) - 1}{5}
\frac{7}{5} y = \frac{15 - 1}{5}
\frac{7}{5} y = \frac{14}{5}

Simplify by 5 by both sides:

7y = 14
y = \frac{14}{7}
y = 2
zzz [600]3 years ago
4 0

Answer:


Step-by-step explanation:

for question number one you want to first combine like terms:

  1.   9x-6.7=11.3  
  2. 9x=18
  3. x=2

for number 2 you should teh smame:

  1. 2.4y-4.9=2.3
  2. 2.4y=7.2

so as long as you combine like terms then proceed to solve you should get the right answers

                                               

   

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