10x-2y=18 8x=y solve by substitution
2 answers:
Answer:
x = -1 and y = 18
Step-by-step explanation:
Given the system of equations
y + 8x = 10... 1
2y - 4x = 40 ... 2
From 1; y = 10-8x
Substitute into 2;
2(10-8x) - 4x = 40
20 - 16x - 4x = 40
20 - 20x = 40
-20x = 40 - 20
-20x = 20
x = -1
Recall that y = 10-8x
y = 10 - 8(-1)
y = 10 + 8
y = 18
therefore your answer is x = -1 and y = 18
10x-2y=18 _______(i)
8x=y________(ii)
put value of y in first equation
=> 10x-2(8x)=18
=>10x-16x= 18
=> -6x= 18
=> x= -3
now to find y put in second equation
8x-y
=> 8(-3)= y
=> y= -24
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