3 years ago

2x +8y =20 -5x-20y=-50

Mathematics

2 answers:

faltersainse [42]3 years ago

6 0

Ax + by =12; 2x + 8y = 60. ax + by = 12; 2x + 8y = 60

Vladimir [108]3 years ago

3 0

System of Equations.
You can either substitute or eliminate a variable.

Substitue:
2x +8y =20
÷2 ÷2 ÷2
x +4y =10
x = -4y +10 (plug this into the second equation)
-5(-4y +10) -20y = -50 (distribute)
20y -50 -20y = -50
-50 = -50
0 = 0

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