Solving a system of linear equations using substitution

Algebra
Tutor: None Selected Time limit: 1 Day

Dec 16th, 2015

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4x+3y=-9-----------(1)

x-2y=-5--------------(2)

from (2)

x=2y-5--------------(3)

substitute for x in (1) form (3)

4(2y-5)+3y=-9

remove brackets

8y-20+3y=-9

simplify

11y=11

y=1


from (1)

4x+3(1)=-9

4x=-9-3

4x=-12

x=-12/4

x=-3


so y = 1  and x= -3



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Dec 16th, 2015

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