a{12/-5},{10/7}
b(-1,2)
c(6,3)
d[1,1/7]
solve the system using elimination 4x-7y=3
x-7y=15
5 answers
4 x - 7 y = 3
-
x - 7 y = 15
___________
4 x - x - 7 y - ( - 7 y ) = 3 - 15
3 x = - 12
Divide both sides by 3
x = - 12 / 3
x = - 4
Replace x = - 4 in equation x-7y=15
- 4 - 7 y = 15
Add 4 to both sides
- 4 - 7 y + 4 = 15 + 4
- 7 y = 19
Divide both sides by - 7
y = 19 / - 7
y = - 19 / 7
-
x - 7 y = 15
___________
4 x - x - 7 y - ( - 7 y ) = 3 - 15
3 x = - 12
Divide both sides by 3
x = - 12 / 3
x = - 4
Replace x = - 4 in equation x-7y=15
- 4 - 7 y = 15
Add 4 to both sides
- 4 - 7 y + 4 = 15 + 4
- 7 y = 19
Divide both sides by - 7
y = 19 / - 7
y = - 19 / 7
Eq1: 4x - 7y = 3.
Eq2: x - 7y = 15.
subtract Eq2 from Eq1 to find X:
Diff.: 3x + 0 = -12,
X = -4.
In Eq2, replace X with -4 and solve for Y:
-4 - 7y = 15,
Eq2: x - 7y = 15.
subtract Eq2 from Eq1 to find X:
Diff.: 3x + 0 = -12,
X = -4.
In Eq2, replace X with -4 and solve for Y:
-4 - 7y = 15,
the answer is (6,3)
(6,3)