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21 September, 06:51

Look at this system of equations.

2x + 5 = 9.5

3x + 5y = 10.5

What is the value of x+y

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Answers (1)
  1. 21 September, 07:18
    0
    x = 2.25 y = 0.75

    Step-by-step explanation:

    2x = 9.5 - 5

    2x = 4.5

    x = 4.5 : 2

    x = 2.25

    know we now what is x so in the second one we evaluate x

    3 (2.25) + 5y = 10.5

    6.75 + 5y = 10.5

    5y = 10.5 - 6.75

    5y = 3.75

    y = 3.75 : 5

    y = 0.75

    that's it!

    if you want to check your answer you can evaluate x and y so it will be like

    2*2.25 + 5

    = 4.5 + 5 = 9.5

    and

    3 * 2.25 + 5*0.75

    = 6.75 + 3.75 = 10.5
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