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Lucia Ponce
Mathematics
9 December, 03:44
Y=7x + 10
y=-4x - 23
+5
Answers (
2
)
Flynn
9 December, 03:48
0
x = - 3
y = - 11
Step-by-step explanation:
to solve this linear equation using substitution method
let us say that
y=7x + 10 ... equation 1
y = - 4x - 23 ... equation2
substitute equation 1 into equation 2
7x + 10 = - 4x - 23
collect the like terms
7x + 4x = - 23 - 10
11x = - 33
divide both sides by the coefficient of x which is 11
11x/11 = - 33/11
x = - 3
put the value of x = - 3 into equation 2
y = - 4x - 23 ... equation2
y = - 4 (-3) - 23
y = 12 - 23
y = - 11
therefore the value of x and y is - 3 and - 11 respectively
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Aliana Nguyen
9 December, 04:00
0
That's two lines; presumably we want the meet.
7x + 10 = - 4x - 23
11 x = - 33
x = - 3
y = 7x + 10 = - 11
Answer: x=-3, y=-11
check:
-4 (-3) - 23 = 12-23 = - 11, good
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