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babymother [125]
3 years ago
8

What is the answer for 5 more than a number y is -2

Mathematics
2 answers:
Rudik [331]3 years ago
4 0
Y + 5 = -2               Mathematical equation that represents this problem.

y = -7                     Subtract 5 from each side.

Answer: y = -7
faltersainse [42]3 years ago
4 0
Try using 'let statements' to start this problem of.

let y = 5 more than -2

now, let's make an equation.

5+y= -2

then,just solve for y by subtracting 5 from both sides of the equation.

y=-7
as a final step, you just need to check.
5+y= -2

5+-7= -2
-2=-2 ✔


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9 burgers and 1 doughnut cost $31.30. 3 doughnuts and 6 burgers cost $26.70. Find the cost of 2 burgers.​
kirill [66]

Step-by-step explanation:

Let assume that

Cost of 1 burger = $ x

Cost of 1 doughnuts = $ y

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\begin{gathered}\sf \: 9x + y = 31.3 \\ \\ \end{gathered}

\begin{gathered}\sf\implies \sf \: y = 31.3 - 9x - - - (1) \\ \\ \end{gathered}

According to statement again, 3 doughnuts and 6 burgers cost $ 26.70

\begin{gathered}\sf \: 6x + 3y = 26.7 \\ \\ \end{gathered}

\begin{gathered}\sf \: 3(2x + y) = 26.7 \\ \\ \end{gathered}

\begin{gathered}\sf \: 2x + y = 8.9 \\ \\ \end{gathered}

On substituting the value of y from equation (1), we get

\begin{gathered}\sf \: 2x + 31.3 - 9x = 8.9 \\ \\ \end{gathered}

\begin{gathered}\sf \: 31.3 - 7x = 8.9 \\ \\ \end{gathered}

\begin{gathered}\sf \: - 7x = 8.9 - 31.3 \\ \\ \end{gathered}

\begin{gathered}\sf \: - 7x = - 22.4 \\ \\ \end{gathered}

\begin{gathered}\bf\implies \: x = 3.2 \\ \\ \end{gathered}

So,

Cost of 2 burgers = 3.2 × 2 = <u>$ 6.4</u>

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