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Augustus Harding
Mathematics
25 February, 17:46
4x - 9y = - 21
- 4x - 3y = 9
+3
Answers (
1
)
Alannah Sanders
25 February, 17:52
0
(-3,1)
y = 1
x = - 3
Step-by-step explanation:
4x-9y=-21
-4x-3y=9
solve the equation
4x=-21+9y
-4x-3y=9
substitute the value of 4x onto an equation
-1 (-21+9y) - 3y=9
multiply - 1 to the numbers in parenthesis
-21+-9-3y=9
add - 9 to 9 and put the negative on nine as a positive.
-21-3y=18
add - 21 to 18 but since 21 is a negative the equation is subtraction.
-3y=-3
divide Both sides by - 3
y=1
substitute the value of y into an equation
-4x-3•1=9
multiply 3 to 1
-4x-3=9
put - 3 as a positive and add 3 to 9
-4x=12
divide both sides by - 4
x = - 3
(-3,1)
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