5) –2x – 9y=-25
-4x – 9y=-23
2 answers:
Answer:
(-1,3)
Step-by-step explanation:
–2x – 9y=-25
-4x – 9y=-23
Multiply the second equation by -1
4x + 9y=23
Add this to the first equation
–2x – 9y=-25
4x + 9y= 23
-----------------------
2x = -2
Divide each side by 2
2x/2 = -2/2
x = -1
Now we need to find y
4x+9y = 23
4(-1) +9y = 23
-4 +9y = 23
Add 4 to each sdie
-4+4 +9y = 23+4
9y = 27
Divide each side by 9
9y/9 = 27/9
y =3
Answer:
(-1,3)
Step-by-step explanation:
-2x-9y=-25
-4x-9y=-23
solve the equation
-9y=-25+2x
-4x-9y=-23
substitute the value of -9y into an equation
-4x-25+2x=-23
minus -4x to 2x. and. minus -25 to -23
2x=-2
divide both aides by 2
x= -1
substitute the value of x into an equation
-9y=-25+2•(-1)
multiply 2 to -1
-9y=-25+-2
add -25 to -2
-9y=-27
divide both sides by &9
y=3
the answer is (-1,3)
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