7x + 5y = -13
-2x - 7y = 21
The system of equations is elimination.
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algebra 1

x = 0.36     y = -3.1

Step-by-step explanation:

(7x + 5y = -13)2

(-2x - 7y = 21)7

14x + 10y = -26

-14x - 49y = 147            Add both equations together

       -39y = 121             Divide both sides by -39

        y = -3.1

Plug -3.1 in for y into one equation

7x + 5(-3.1) = -13

7x -15.5 = -13

    +15.5    +15.5           Add 15.5 to both sides

7x = 2.5                        Divide both sides by 7

x = 0.36

if x decreases by 4 then y increases by 10

step-by-step explanation:

step-by-step explanation:

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