Question

9x+8y=-5
-8x+y=45
solve by substitution method

Answer 1

X=
Y=

Answer 2

y = 8x + 45
9x+ 8(8x+45) = -5
9x + 8(8x + 45) = -5
9x + 64x + 360 = -5
73x = - 365
x = -5

Substitute x =-5 into 9x + 8y = - 5
-45 + 8y = - 5
8y = 40
y = 5

Answer 3

or from
9x+8y=-5
8y=-9x-5
y=(-9x-5)/8 sub to -8x+y=45 to get
-8x+(-9x-5)/8 =45 , mult by 8 on both sides to get
-64x+(-9x-5)=360
-73x-5=360
-73x=360+5=365
x=-365/73=-5 ans, sub this to 8y=-9x-5
8y=-9(-5)-5
8y=45-5=40
y=40/8=5 ans

Answer 4

my pc keeps hanging up on me..lol

Answer 5

do you wanna know how you check if you work is correct?

Answer 6

there is another method that you need to learn, you can use this also for checking your work..by addition or subtraction simultaneously

Answer 7

9x+8y=-5 9x+8y=-5
-8x+y=45 mult by 8,then subtract -( -64x+8y=360)
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73x +0=-365
x=-365/73=-5 now sub this to the other EQ

Answer 8

good luck now stacy,,have fun..lol

Answer 9

thanks