Question

solve the siumulteneus. 3x-4y-15=0, y+x+2=0​

Answer 1

Solve $3x-4y-15=0$ and $y+x+2=0$

Definition:

The solution of an equations is the set of all values that,when substituted for unknowns,make an equation true.

Step-by-step explanation:

Rewrite the given equations as follows,

$3x-4y=15$          (1)

$x+y=-2$           (2)

Multiply equation (2) by 3

$3x+3y=-6$       (3)

Subtract equation (2) and (3)

[tex]3x-4y=15\\ 3x+3y=-6[/tex]

(-)   (-)       (+)

__________

[tex]-7y=21\\ y=-3[/tex]

Substitute $y=-3$ in equation (2)

[tex]x+y=-2\\ x+(-3)=-2\\ x-3=-2\\ x=-2+3\\ x=1[/tex]

Therefore,the value of x is 1 and y is -3.