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(Lesson 11.3) Solve by adding or subtracting. (2 points)(x + y = -104.(2x - y = -8I

Lesson 113 Solve By Adding Or Subtracting 2 Pointsx Y 1042x Y 8I class=

Sagot :

Given,

The equations are

[tex]\begin{gathered} x+y=-10........(1) \\ 2x-y=-8.........(2) \end{gathered}[/tex]

To find: Solve both equations.

Solution:

Add both equations (1) and (2)

[tex]\begin{gathered} (x+2x)+(y-y)=(-10-8) \\ 3x+0=-18 \\ 3x=-18 \\ x=-6 \end{gathered}[/tex]

Substitute x = -6 in equation (1)

[tex]\begin{gathered} -6+y=-10 \\ y=-10+6 \\ y=-4 \end{gathered}[/tex]

Hence, the value of x and y is -6 and -4.

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