How do you solve 7x+2y=−29 and −8x+y=43 using substitution?
1 Answer
Apr 18, 2017
x=−5
y=3
Explanation:
Given -
7x+2y=−29 -----------------(1)
−8x+y=43 ------------------(2)
Solve the 2nd equation for
y=43+8x
Substitute
7x+2(43+8x)=−29
7x+86+16x=−29
23x=−29−86=−115
x=−11523=−5
x=−5
Substitute
−8(−5)+y=43
40+y=43
y=43−40=3
y=3
