Solve the pairs of simultaneous equations by the substitution method.

5x-9y=17
3x-8y=5

3 answers

(poor method for this particular question, but ...)

solve the second for x, (I look for the smallest coefficient)

3x = 5+8y
x = (5+8y)/3

sub into the first
5(5+8y)/3 - 9y = 17
multiply by 3 to eliminate fractions
5(5+8y) - 27y = 51
25 + 40y - 27y = 51
13y = 26
y = 2
then x = (5+16)/3 = 7
2x+4y=8
3x+4y=16
4x+7y=15
5x+9y=,19
Similar Questions
    1. answers icon 1 answer
    1. answers icon 1 answer
  1. how do i solve two step equations?Do you mean two equations in two unknowns? The method of substitution is one way. There is a
    1. answers icon 0 answers
  2. Solving Simultaneous Equations Using Substitution PracticeComplete this assessment to review what you’ve learned. It will not
    1. answers icon 1 answer
more similar questions